added .gitignore to libspimage, taken from Hawk with updated file list that show up when typing # On branch master
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#	new file:   .gitignore
# after compiling the library
Fixed a bug in image_io.c so that read_cxi() reads in the mask properly from a CXIDB file