cs_set_video_encoder_resolution improvements.
Fixed some A/V threading issues.

Audio dropping on video calls issue should no longer happen.
Cut one on one default audio bitrate by half.
Removed calloc from logger_init, because the pid was no longer being appended.
Merge branch 'master' of https://github.com/irungentoo/toxcore into logger_init_fix
Build system fixes.

libtoxcore.pc now has -lpthread like it's supposed to on systems
where it is needed.
Added cscope.files to .gitignore
Merge branch 'logger_init_fix' of https://github.com/jdp5087/toxcore
Merge branch 'cscope.files' of https://github.com/jdp5087/toxcore
auto test group titles.
Fixed bug in tox_load where names of size TOX_MAX_NAME_LENGTH didn't
load.
Improved detection of dead paths.
Update INSTALL.md

pkg-config is required for proper autodetection of opus and vpx,
without it they are not detected by ./configure on Debian 7.
Merge branch 'instructions' of https://github.com/zetok/ProjectTox-Core