Merge branch 'master' of git://factorcode.org/git/factor

* 'master' of git://factorcode.org/git/factor:
  Fix UI pane selection
  use unicode instead of ascii again
  Fix up 'demos' vocab
  beginnings of a c preprocessor -- needs #if, #elif, #else
  Tabs are blank (better unicode whitespace support coming soon)
  fix take-rest for out of bounds
  Partial fix for pane selection
  ensure-port outputs a new URL instead of mutating its input
  FUEL: Font lock and no indentation for EBNF: ... ;EBNF forms.