* Fixed ATI mac "lighting and shadows" related crash
* Fixed up numerous GL errors on macs related to multiple color formats,
  the use of glEnable/glDisable on textures above the texture unit count
  and old ATI-specific code that was not appropriate for Mac.
* Disabled SSAO for ATI macs due to it not working with shadows
* Ongoing work to properly get shadows and SSAO functioning on ATI macs is required.

Reviewed by davep

* Disabled SSAO on macs with 8 or less texture units.
* Slight cleanup of sunlight fragment shaders to remove unused texture units.

Reviewed by davep

* Modified mac feature table to bring it up to date with latest renderer features including deferred rendering
* Changed mac AGL pixel format to no longer allow it to revert to software rendering when shader compilation errors occur.
* Fixed up various GLSL shader compilation warnings and errors that came up as a result of the above changes.
* Changed initial conditions for the "hardware skinning" checkbox on the preferences floater so it can be modified before login on machines that support avatar vertex programs.
* Removed unused avatarAlphaF.glsl files

Reviewed by davep

SH-1387 Class0 video cards default avatar physics to high

Added appropriate featuretable entries.

SH-1387 Class0 video cards default avatar physics to high

Added appropriate featuretable entries.

Revert to previous behavior.  Reflections stay at "minimal".

First implementation with UI changes.

VWR-21349 Don't enable FBO by default on mac or linux when using high/ultra graphics.  Cap samples in LLMultiSampleBuffer to 4 samples to avoid using tons of memory when RenderUseFBO is set to TRUE and RenderFSAASamples is > 4.  Don't allocate multisample buffers at all when RenderUseFBO is FALSE.

VWR-21349 Don't enable FBO by default on mac or linux when using high/ultra graphics.  Cap samples in LLMultiSampleBuffer to 4 samples to avoid using tons of memory when RenderUseFBO is set to TRUE and RenderFSAASamples is > 4.  Don't allocate multisample buffers at all when RenderUseFBO is FALSE.

SH-157 Add "RenderLocalLights" to preferences and featuretable to replace old local lights on/off radio group.

SH-287 FIXED Anti-aliasing setting does not take effect until relog

Added logic to control RenderUseFBO setting based on graphics quality.  RenderUseFBO controls whether anti-aliasing is enabled.

Add featuretable_xp, set default VolumeLODFactor to 0.5 for class 0 hardware, and disable impostors on Intel 965 on xp.

back-out the back-out for this branch.  yay.

Backing out this merge that I pushed (prematurely) to the wrong place.

Fixes for DEV-50619 Have the low graphics settings be the lowest possible settings for settings with slider bars and DEV-50618 Have Draw Classic Clouds be off for low graphics settings and DEV-50616 Toggling Draw Classic Clouds does not actually prevent them from being drawn if clouds have been drawn once.  Reviewed by qarl

set RenderAvatarMaxVisible to be 3 by default for low-end settings.

EXT-2973 : turned off RenderDelayVBUpdate for all platforms and bumped feature table to apply it.  Should solve index buff overflows.

Reviewed by Davep

svn+ssh://svn.lindenlab.com/svn/linden/branches/viewer/viewer-1.23.threefour-merge-1a

QAR-1592 Merge of changes between 1.23 RC2 and 1.23 Final to trunk

svn merge -c 106471 svn+ssh://svn.lindenlab.com/svn/linden/qa/viewer_1-22-106055_merge

QAR-992 Merging revisions 101012-101170,101686-101687 of svn+ssh://svn.lindenlab.com/svn/linden/qa/viewer_combo_1-22-merge into linden/release

merge viewer/viewer_1-21-0 94830-95157 -> release
Includes:
QAR-786 Sandbox buildme for viewer + server Release Notes on the wiki!
QAR-797 teleport failures (DEV-6198 / SVC-972) mergeme

QAR_367 (RC1) - merge Branch_1-19-1-Viewer -r 81609 : 81993 -> release
QAR-374 (RC2) - merge Branch_1-19-1-Viewer -r 81993 : 82589 -> release
QAR-408 (RC3) - merge Branch_1-19-1-Viewer -r 82589 : 83128 -> release
QAR-426 (rc4) - merge Branch_1-19-1-Viewer -r 83125 : 83719 -> release
(Actual merge: release@83793 Branch_1-19-1-Viewer-merge@83953 -> release)

QAR-389

DEV-11202: Unhandled Excpetion in pipeline.cpp.
Merged over updated windlight ui help text from windlight14.
Reverting a const change in a virtual that was not propagated to all overrides.
DEV-10957 stop and pause Media and music buttons do not work
DEV-10762 Displayed page in the client browser disappears when crossing property boundaries.
DEV-11220 replace misspellings in alerts.xml parameters of 'messsage'
DEV-11221 fix a misspelling of 'participants' in floater_chat_history.xml tooltip
DEV-11193 clean up some viewer strings related to Windlight help text
svn merge -r81144:81147 svn+ssh://svn/svn/linden/branches/1-19-1-viewer-threads
DEV-11110  	 Media browser history dropdown does not save items across sessions
Ran the xuiparse -process tool on all en-us xml files.  This does NOT change any data, merely reorders attributes and cleans up tab/spacing.
DEV-11349 XML CLEANUP: fix duplicate sibling names in en-us xui files
DEV-11348 Change to llmimetypes.cpp broke Media Type dropdown
dev-10623 "parcels that played movies no longer work in combo-merge-ui"
DEV-11379 - crash in LLTabContainer::draw()
DEV-11377 Elminiate dangerous LLLinkedList and LLDoubleLinkedList from newview
DEV-11158 sculpties on the top10 crash list
DEV-11404 "Send Current URL to Parcel" does not set the MIME type
merge 80958:80959 maint-ui-9-qa, DEV-11105 -- Searching for people with 3 characters like "j l" hurts the database.
DEV-10489: no draw distance cheating
DEV-879: water noise frequency
DEV-10764: macbook air support
DEV-10878: Linux Intel945 support
DEV-7551: featuretable adjustments for framerate.
DEV-11426 Enormous mini-map.
DEV-11505 - Crash in gunzip_file.
Removed final LinkedList, SkipMap, and AssocList templates from the Viewer!
DEV-11115  truncated word in the Advanced Water Editor's modal help dialog

windlight14 which have passed QA (up through r79932).

svn merge -r 80831:80833 svn+ssh://svn.lindenlab.com/svn/linden/branches/merge_windlight14_r80620

EFFECTIVE MERGE: svn merge -r 66133:68118 svn+ssh://svn/svn/linden/branches/maintenance into release

Actual action: branched maintenance-r68118, merged in release, then copied result into release