Update admin/gentoo/puse

* Fix error (inexistent variable as rvalue) when parsing a malformed
  package line.
* Fix missing padding when updating the flags on a line with an
  end-of-line comment, if the new flags exceed the previous location of
  the comment.
* Add at least 1 character of padding to all line constructions
  (for safety; except for the above fix, should not be needed)

Version: 0.3.1