Creates and locks a lockfile. Similar to the behavior of MvLOCKFILE without the closing /MvLOCKFILE behavior. It also creates the exact filename, rather than appending ".lck" to the filename as MvLOCKFILE does.
miva_lockfile( path, location )
Returns 1 if sucessful, -1 if fails
path = fully qualified path to the file
location = location of the file - 'data' or 'script'
Use fdelete() or sdelete() to delete the lockfile.