_NAME_
file_exists

_PROTOTYPE_
result = file_exists(path);

_SHORT-DESCRIPTION_
Check on the existence of a file

_DESCRIPTION_
file_exists is used primarily by the put data routines to check if an
archive data file exists already or needs to be created and initialized.
Returns 1 (true) if the file does exist, and 0 (false) if not.  If the
file is actually a directory, 0 is returned.

_SHORT-CODE-SAMPLE_
filePath = "/home/idunn1/rgr/dataStorage/data1.out"
if (file_exists(filePath)) then print, filePath, " exists."	$
else print, filePath, " does not exist."

_INPUT_
* path is the file's path string.

_OUTPUT_
* 1 if the file exists.
* 0 if the file does not exist (or if the file is actually a directory.)