0.0-6 sig is now generic and works for character, formula and name input. 0.0-5 Now works for primitives. 0.0-4 Separated listing and writing of sigs in to list_sigs/write_sigs. write_sigs now defaults to writing to stdout. Operators' and assignment fns' sigs wrapped in backquotes. Added siglist indexing. 0.0-3 Added sig_report. 0.0-2 Added pkg2env; pattern arg for write_sigs. 0.0-1 First version, include sig, toString.sig, print.sig, write_sigs.