_NAME_
directory_exists

_PROTOTYPE_
result = directory_exists(path);

_SHORT-DESCRIPTION_
Check on the existence of a directory

_DESCRIPTION_
directory_exists is used primarily by the put data routines to check if an
archive directory already exists (before createDirectory is called).
Returns 1 (true) if the directory does exist, and 0 (false) if not. 

_SHORT-CODE-SAMPLE_
directoryPath = "/home/idunn1/rgr/dataStorage";
if (directory_exists(directoryPath)) then print, directoryPath, " exists." $
else print, directoryPath, " does not exist."

_INPUT_
* path is a string holding the directory's path.

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