Drop git-wtf and git-up from the repo

I didn't find those useful in my everyday git routine, though I actively
used those while migrating from GitHub OS X client to console git.
Add darcs configuration

Well, darcs rocks. Check it out:
http://darcs.net/
Migrated to ISC license (and you should too)

MIT is good enough, but too long and contains some amount of gibberish.
ISC is just like MIT, and juridically is the same license, but it is
written more concise and thus shorter.

I have dropped Unlicense from the repo because:
  1) Most of the text isn't about licensing terms, but is just a
  promotion of public domain licensing
  2) It doesn't work everywhere (unlike MIT and ISC)
  3) Even CC0 is better because it contains a fallback for countries
  that don't allow moving works to public domain
Move Fish configuration to the place where it actually belongs