add miscellaneous color and openfilestruct cleanups, and move the
openfilestruct functions to nano.c, since they're no longer specific to
file operations


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2903 35c25a1d-7b9e-4130-9fde-d3aeb78583b8
8 files changed