There were two distinct LLMemory methods getCurrentRSS() and
getWorkingSetSize(). It was pointless to have both: on Windows they were
completely redundant; on other platforms getWorkingSetSize() always returned
0. (Amusingly, though the Windows implementations both made exactly the same
GetProcessMemoryInfo() call and used exactly the same logic, the code was
different in the two -- as though the second was implemented without awareness
of the first, even though they were adjacent in the source file.)

One of the actual MAINT-6996 problems was due to the fact that
getWorkingSetSize() returned U32, where getCurrentRSS() returns U64. In other
words, getWorkingSetSize() was both useless *and* wrong. Remove it, and change
its one call to getCurrentRSS() instead.

The other culprit was that in several places, the 64-bit WorkingSetSize
returned by the Windows GetProcessMemoryInfo() call (and by getCurrentRSS())
was explicitly cast to a 32-bit data type. That works only when explicitly or
implicitly (using LLUnits type conversion) scaling the value to kilobytes or
megabytes. When the size in bytes is desired, use 64-bit types instead.

In addition to the symptoms, LLMemory was overdue for a bit of cleanup.

There was a 16K block of memory called reserveMem, the comment on which read:
"reserve 16K for out of memory error handling." Yet *nothing* was ever done
with that block! If it were going to be useful, one would think someone would
at some point explicitly free the block. In fact there was a method
freeReserve(), apparently for just that purpose -- which was never called. As
things stood, reserveMem served only to *prevent* the viewer from ever using
that chunk of memory. Remove reserveMem and the unused freeReserve().

The only function of initClass() and cleanupClass() was to allocate and free
reserveMem. Remove initClass(), cleanupClass() and the LLCommon calls to them.

In a similar vein, there was an LLMemoryInfo::getPhysicalMemoryClamped()
method that returned U32Bytes. Its job was simply to return a size in bytes
that could fit into a U32 data type, returning U32_MAX if the 64-bit value
exceeded 4GB. Eliminate that; change all its calls to getPhysicalMemoryKB()
(which getPhysicalMemoryClamped() used internally anyway). We no longer care
about any platform that cannot handle 64-bit data types.

continued conversion to units system
made units perform type promotion correctly and preserve type in arithmetic
e.g. can now do LLVector3 in units
added typedefs for remaining common unit types, including implicits

converted many values over to units system in effort to track down
source of 0 ping

replace llinfos, lldebugs, etc with new LL_INFOS(), LL_DEBUGS(), etc.

(per Monty code review)
The notion of storing LLMemoryInfo data both as an LLSD::Map and an
LLSD::Array of pair arrays arose from a (possibly misguided) desire to
continue producing stats output into the viewer log in the same order it
always used to be produced. There is no evidence that anyone cares about the
order of those stats in the log; there is no other use case for preserving
order. At Monty's recommendation, eliminate generating and storing the
array-of-pair-arrays form: directly store LLSD::Map.

Recast stream() to display data from LLSD array rather than reinvoking OS
operations used to capture it.
Make refresh() cache LLSD data in map form as well as array; fetch items from
that in a few places to avoid going back to OS.

This is known not to compile on Mac yet; checking in to concurrently work on
Linux-specific code.

Change Linux fasttimer implementation back to RDTSC - using a reliable syscall was REALLY chewing CPU time.  Sigh.  I didn't realize how incredibly often this gets called.  So, back to the assembly.
But be more careful with CPU clock count on linux, so the fasttimer values are much more accurate than they were the last time we were with RDTSC, in absolute terms - back in the right order of magnitude anyway.

Also change many instances of Mhz to MHz.
Also some minor comment fixes.

--HG--
branch : product-engine

by which "moved LLDisplayInfo to llwindow, implemented getting the width/height of screen for mac os and linux."

--HG--
branch : product-engine

Working on major bug EXT-4820([NUX] Viewer dimensions on first-run) - moved LLDisplayInfo to llwindow, implemented getting the width/height of screen for mac os and linux.

--HG--
branch : product-engine

need to specify desctop width and height for macos and linux (see LLDesctopInfo in llsys.cpp for details)

--HG--
branch : product-engine

Ok, finally got this to a point where it doesn't break the build and I can check
in. llcommon can be built as a shared library (disabled but can be enabled with
cmake cache var LLCOMMON_LINK_SHARED.

reviewed by Mani on tuesday (I still need to get his suggested changes
re-reviewed)

Result of svn merge -r107256:107258 svn+ssh://svn/svn/user/phoenix/license_2009_merge into trunk. QAR-1165

dataserver-is-deprecated

svn merge -r74200:76302 svn+ssh://svn.lindenlab.com/svn/linden/branches/Branch_1-18-6-Viewer --> release

Wheee, this was fun. Um, let's back-port fixes a little more rapidly next time. Reviewed by CG until alexandria died, did the rest by my lonesome.

Result of svn merge -r71162:71205 svn+ssh://svn/svn/linden/branches/new-license into release. only changes files which are not deployed or the comments section of code.

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

EFFECTIVE MERGE: svn merge -r 65485:66133 svn+ssh://svn/svn/linden/branches/maintenance into release
This includes fixes to the maintenance-r66133 branch, and sync'ing up with release@r66392

ACTUAL MERGE: svn merge -r 66394:66435 svn+ssh://svn/svn/linden/branches/release-r66392 into release
EQUIVALENT TO: svn merge -r 65485:66434 svn+ssh://svn/svn/linden/branches/maintenance-r66133 into release (plus branch sync'ing)

svn merge -r 62595:62596 and 62598:63308 sse-skinning-3 for faster software avatar rendering.  Visual Studio 2005 project file fixed pending.