Fix gcc warning: ordered comparison of pointer with integer zero

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10935 387891d4-d844-0410-90c0-e4c51a9137d3
for Mantis #2651: revert r10933, per forum discussion: http://www.hard-light.net/forums/index.php?topic=88047.0

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10937 387891d4-d844-0410-90c0-e4c51a9137d3
for Mantis #2064: remove ship template feature which never worked without crashing

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10938 387891d4-d844-0410-90c0-e4c51a9137d3
some const-correctness in preparation for the Mantis #3071 patch

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10939 387891d4-d844-0410-90c0-e4c51a9137d3
use static casts to make our intentions clear and prevent compiler warnings

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10940 387891d4-d844-0410-90c0-e4c51a9137d3
a tweaked version of ngld's patch for additional main hall capabilities (see Mantis #3071)

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10941 387891d4-d844-0410-90c0-e4c51a9137d3
Fix several gcc warnings in code/graphics/gropengldraw.cpp

variable ‘clipped’ set but not used [-Wunused-but-set-variable]
variable ‘swapped’ set but not used [-Wunused-but-set-variable]
the address of ‘Distortion_texture’ will always evaluate as ‘true’
[-Waddress]
declaration of ‘vertex’ shadows a global declaration [-Wshadow]

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10943 387891d4-d844-0410-90c0-e4c51a9137d3
Fixed RTT bugs: 1) inverted geometry, 2) the output being mirrored both ways and a quarter of the output missing if post-processing is off.

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10944 387891d4-d844-0410-90c0-e4c51a9137d3
Fixed inverted normals in RTT if post-processing is on.

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10945 387891d4-d844-0410-90c0-e4c51a9137d3
Turned the required SEXP variable arguments for add-background-bitmap and add-sun-bitmap into optional arguments.

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10946 387891d4-d844-0410-90c0-e4c51a9137d3
Fixed bits missing from r10946.

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10947 387891d4-d844-0410-90c0-e4c51a9137d3
Fix Coverity ID 1228858 Missing varargs init or cleanup

In required_string_one_of(int arg_count, ...)

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10948 387891d4-d844-0410-90c0-e4c51a9137d3
Fix Coverity 1228854 Copy-paste error

Check pof_file_hud for "$POF target file:" not pof_file ("$POF file:")

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10949 387891d4-d844-0410-90c0-e4c51a9137d3
Fix gcc warnings in globalincs/alphacolors.cpp

warning: declaration of ‘i’ shadows a previous local [-Wshadow]

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10950 387891d4-d844-0410-90c0-e4c51a9137d3
From MageKing17: Followup to r10914. Makes the name check ignore case.

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10951 387891d4-d844-0410-90c0-e4c51a9137d3