Rename llround(..) to ll_round(..) because of a collision with MS llround (long long round) in VS2013

Fix some sliders to min/max at proper values
Add buttons to each glow/dof slider to default setting values
Add checkbox to enable DoF Film Grain

MAINT-3880 FIX Show favorite landmarks on login screen checkbox, is checked in preferences after being unchecked

 - memory leaks fixing;

 - memory leaks fixing;

Add menu entry to Build->Options->Set Default Permissions...
Disable Preferences->Advanced->Default Creation Permissions button when on login screen
Add code for a one-time conversion from the old upload settings
XML cleanup

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

consolidated most indra-specific constants in llcommon under indra_constants.h
fixed issues with operations on mixed unit types (implicit and explicit)
made LL_INFOS() style macros variadic in order to subsume other logging methods
such as ll_infos
added optional tag output to error recorders

Bonus: Correct the immediately preceding auto replace comment

CHUI-799 FIXED Notification is not given to user when they select only friends and groups can IM me preference

CHUI-778: Now when changing paths for chat logs and transcripts any empty conversations will be reloaded with data from the new location. Use case for this is if the users nearby chat is empty and they switch to a location that has a nearby chat file, then the nearby chat file be loaded.

CHUI-778 (Saving preferences updates text in all open message panels in conversation floater to show as old messages) Now changing the log/transcripts file location actually moves the files to the new location. Prior behavior just started a new history at that location. Also a fix was made so that if the user changed the log/transcripts path then after pressing the Preferences 'OK' button the new location will be saved to the corresponding .xml file.

CHUI-778: Minor changes, prior commit was not changing the file path correctly due to logic error. Also clicking the 'Cancel' in preferences would still cause the file location to be saved instead of ignore the save.

CHUI-778 (Saving preferences updates text in all open message panels in conversation floater to show as old messages) Problem was that closing the preferences floater was always acting as if the conversation transcripts/log files path had changed. If the path did not change then the user's conversations would be cleared and re-loaded as if they were part of the user's history (causing text to be grey). Solution: Now keep track of when the path was changed and only load up the transcripts/log upon change.