Function: icy_test Purpose: Tests whether the idl/icy module is installed Provides installation message if not installed Keywords: None Returns: 1 on success 0 on failure Example: if(icy_test() eq 0) then return Notes: Should be called in all idl icy wrapper routines $LastChangedBy: peters $ $LastChangedDate: 2012-08-01 12:02:01 -0700 (Wed, 01 Aug 2012) $ $LastChangedRevision: 10763 $ $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/external/IDL_ICY/icy_test.pro $