miscellaneous bug fixes

git-svn-id: svn://svn.code.sf.net/p/sauerbraten/code@5053 07af1644-1164-4067-b897-63bf4dc9b748
(cherry picked from commit c2934b0d33ebb018bd5650fb59162c2ad60e7959)

Conflicts:
	src/engine/lensflare.h
	src/engine/md5.h
ipmask::parse fix

git-svn-id: svn://svn.code.sf.net/p/sauerbraten/code@5054 07af1644-1164-4067-b897-63bf4dc9b748
(cherry picked from commit 9408f0ac7e2bca0c9a36f6ba316a505e772e551a)
clear jumping on reset

git-svn-id: svn://svn.code.sf.net/p/sauerbraten/code@5058 07af1644-1164-4067-b897-63bf4dc9b748
(cherry picked from commit 58e0dc9ac291f941caeb9167c822ec9e0279abd6)
extentity flag cleanup

git-svn-id: svn://svn.code.sf.net/p/sauerbraten/code@5060 07af1644-1164-4067-b897-63bf4dc9b748
(cherry picked from commit 911237b9b966ec33d49afc578381346d560e67f3)

Conflicts:
	src/engine/cubeloader.cpp
	src/engine/physics.cpp
	src/engine/renderva.cpp
	src/engine/sound.cpp
	src/engine/world.cpp
	src/engine/worldio.cpp
	src/fpsgame/ai.cpp
	src/fpsgame/entities.cpp