RexxTool

Changelog: version 1.4.2 * fixed: Task_Change sometimes failed to set G.0FileChanged flag * Recognize literal string as a variable name, as in value() or SysFileTree() This should make Variables, Change, and Unused commands slightly more accurate. also affects Task_Recap and Check_Expose tasks. * improved Task_UnusedVars-- use MakeVarListsE, added -alt switch, minor bugfixes * fixed: in QuotedVar(), value('foo', , 'os2environment') returned 'SET' for variable foo, should be 'USED' likewise for symbol('Map.'!tmp'.start') returned 'SET' for 'Map.' and '.start', should be '' * fixed: in MakeVarListsL line number was not shown for stems * Task_CheckStyle, added warning for SELECT without OTHERWISE * allow help search for a quoted string, like RexxTool.cmd help "else if" * replaced OS2Var() with EnvVar(), which will work for either Regina or OS/2 Rexx; fixes Depend command under Regina * Improved R_MoveClauseDown, added 'newline' argument. Task_ThenDo now calls R_MoveClauseDown instead of shifting tokens itself. * Removed the last of the calls to MidStr(); use substr() instead. Should make Tokeniser slightly faster.