Add original man page from the MWC sources

[lewiscollard]

Currently the only extended documentation is in the PNG file, which cannot be copy-pasted or read easily by people not using graphical displays. So I pulled the original man page from the MWC sources, and reformatted it to use -man macros to the best of my ability. I lightly edited some text while I was there; those edits should not change any meaning. I also documented the -l option, because that was not in the original man page (obviously).

For posterity, I've included the original manual page sources; this will allow anyone to come by and do a better job of the same conversion later.

Also, I did a driveby add of .gitignore so that the compiled binary lc doesn't ever get accidentally committed to the repo. You can guess why I found the need for that.

Thanks for porting a bit of history to modern systems! I like lc, and not just because it has the same initials as me.

[dbohdan]

This is cool. I have merged this PR in my very new Go port, lc-go. I found that I had to rename lc.man to lc.1 because man ./lc.man didn't work on NetBSD. (lc itself builds and works on NetBSD.)

[lewiscollard]

I found that I had to rename lc.man to lc.1 because man ./lc.man didn't work on NetBSD.

Thanks for that - that is probably the correct naming convention. :) Fixed in the latest force push.