pink_input_test
Arguments:
Description:
Test file type of file_name for pnk (pink) and pnm (portable anymap) file type.
Routine returns the first character from the first non comment line in status. Only [
PQesbnBNcCdDGS#] are allowed,
'P'=80 is returned for pgm files with type <> P2 (not ascii pgm),
'Q'=81 is returned for pgm files with type == P2.
[
esbnBNcCdDGS] is returned for PINK list files where the second char is ' '.
'#'=35 is returned otherwise.