configure.ac: Remove syntax highlighting fix
configure.ac: Do not use pedantic error checking
Add feature test macros for posix functions
Fix a bug with position calculation
configure.ac: Change maintainer flags in CFLAGS

 * Fix errors that surface with the new warnings
   and errors.
 * Use C99 compilation mode
Whitespace, Comments, Debugging
Add a custom entry for color palettes
Makefile.am: Fix recursive definition problem in makefile
Fix setting custom colors in palette

 * There was an error in the way the index
   was computed.
 * Fixes #19