FindGSpreadSheet, FindGWorkSheet
FindGSpreadSheet, FindGWorkSheet

Split FindGSheet into two separate functions for spreadsheets and
worksheets, so they can be called independently.  Also, fixed up the
logic for both.

ENCODE-DCC/WranglerScripts,ENCODE-DCC/WranglerScripts,ENCODE-DCC/WranglerScripts,ENCODE-DCC/WranglerScripts