Fix UnitDef::GetDeathExplosion and UnitDef::GetSelfDExplosion
fix headless linking
fix some compile warnings
Merge pull request #146 from rlcevg/fix_getexplodeas

Fix #4633
fix compile warning (unused var)
update pr-downloader: increase connect timeout & more verbose error messages
fix logic in CpuID.cpp
(found by static code analyzer http://www.viva64.com/en/b/0293/)
fix logic error
(found by static code analyzer http://www.viva64.com/en/b/0293/)
update hughai
fix #4634: crash in rts/Sim/Misc/CollisionHandler.h:59
style
fix cppcheck warnings
Merge remote-tracking branch 'origin/release' into develop