Merge remote-tracking branch 'singu/master'

Conflicts:
	indra/newview/llviewerwindow.cpp

c_str() dropped out (50f03d83c0c04e415aae0f5451f15d1a2621abf1).
Added it back.
Remove -Wno-sign-compare and fix DISABLE_FATAL_WARNINGS

Turn on sign-compare warnings and allow fatal warnings when
using -DDISABLE_FATAL_WARNINGS:BOOL=OFF during configuration.
The default is no -Werror.
Merge remote-tracking branch 'singu/master'
Add -Wno-sign-compare back.
Inline accessors of HippoGridInfo.
Allow the export check box to show for rezzed objects in opensim - fixes a copypasta error
Merge remote-tracking branch 'lirusaito/master'
Merge remote-tracking branch 'aleric/master'
Update to linux_tools

Modernizes viewer_manifest.py
adds install.sh and refresh_desktop_app_entry.sh for those who want to "install" Singularity to their applications.
Updates client-readme-voice.txt to explain about Multi-Voice
File Menu Frosting~

Adds Minimize All, and Change Local Textures options
People keep adding how to do Local Textures, here's an easy way right where it'd be expected!
Group Feature Request: Optionally display indicator over typing avatar's heads.

Adds Debug Setting UseTypingBubbles
Adds "Use overhead typing indicator bubbles" to Adv. Chat-> Chat/IM
Thanks to Firestorm for this simple addition
French Translation Update!
Merge branch 'Frosting' of git://github.com/Lirusaito/SingularityViewer