Added winnnow function
Added winnow by percent composition option
Set up grep, uniq, and wc argument parsers and stubs
Fixed prior commit bugs and implemented wc
Specified hash and equality handling in FSeq
Implemented uniq class
Implemented grep class
Merged develop with dev-unixcmd
Merged develop and dev-winnow
Tidied the code and help menus
Added succinct meta variables to help menus