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@10946 387891d4-d844-0410-90c0-e4c51a9137d3
Fixed bits missing from r10946.

git-svn-id: svn://svn.icculus.org/fs2open@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@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@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@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@10951 387891d4-d844-0410-90c0-e4c51a9137d3
Fix gcc warning in io/keycontrol.cpp

suggest parentheses around ‘+’ in operand of ‘&’ [-Wparentheses]
This code previously worked only by fluke!

git-svn-id: svn://svn.icculus.org/fs2open@10952 387891d4-d844-0410-90c0-e4c51a9137d3
From MageKing17: tweak team colors

While we're looking at the Team Color code, let's have a warning if
someone tries to name a team 'none', and avoid pushing duplicate teams
to the Team_Names vector.

git-svn-id: svn://svn.icculus.org/fs2open@10953 387891d4-d844-0410-90c0-e4c51a9137d3
Fix gcc warnings in hud/hud.cpp

declaration of ‘render’ shadows a member of 'this'
declaration of ‘font’ shadows a global declaration [-Wshadow]
variable ‘flags’ set but not used [-Wunused-but-set-variable]

git-svn-id: svn://svn.icculus.org/fs2open@10954 387891d4-d844-0410-90c0-e4c51a9137d3
Fix gcc warnings in hud/hudtarget.cpp

declaration of ‘gauge_object’ shadows a member of 'this'
declaration of ‘esct’ shadows a global declaration [-Wshadow]
variable ‘srange’ set but not used [-Wunused-but-set-variable]
variable ‘ship_is_ballistic’ set but not used

git-svn-id: svn://svn.icculus.org/fs2open@10955 387891d4-d844-0410-90c0-e4c51a9137d3
Fix Coverity 1093822 Uninitialized scalar variable

Set sensible looking defaults for the elems added to the beam_collision
struct since retail

git-svn-id: svn://svn.icculus.org/fs2open@10956 387891d4-d844-0410-90c0-e4c51a9137d3
Fix Coverity ID 1093805 Uninitialized scalar variable

1st use of fbfire_info.bfi_flags so assign instead of |=

git-svn-id: svn://svn.icculus.org/fs2open@10957 387891d4-d844-0410-90c0-e4c51a9137d3
Doh! Assign, not equality!

git-svn-id: svn://svn.icculus.org/fs2open@10958 387891d4-d844-0410-90c0-e4c51a9137d3