Routine Name:	where

Description:	Returns name of operating-system directory in which specified
		file is located.

Usage:		where filename

		filename	name of file to search for (must be actual
				name; where does not add a .g if you do not
				explicitly supply it, and does not accept
				wildcarded names)

Example:	genesis >  where mysim.g
		'mysim.g' found in .

		genesis >  where fooby
		could not find 'fooby' in . /usr/genesis/startup

Notes:		The where routine searches the script path list (as specified
		in the operating system environmental variable SIMPATH) and
		reports the first instance found of the specified file.

