Pkgbuilder

Applying patches from vadmium/pkgbuilder, also adding a few other fixes and
changing the ``pb`` version number up to 0.2.0.

Fixing a quite important bug in the install process

2013! Oh, and the revision number is 13, too!

AUR v2.0 support.

And another issue that I have not noticed, in a tiny change of Update
behavior. Sorry for all those updates, but I do not do testing on
everything, just on stuff I think could break a lot (have you seen a bugfix
for the ABS build magic? I haven’t. Well, the validation fix was
partially related to the ABS magic, but it was detected during a run of
``pb -S`` with an inexistent package that I thought might exist. I
actually revised all the changes that happened since 2.1.5.5 (a release
without those bugs) and I think I’m done with everything now.

A bug in the wrapper fixed. Sorry, but sometimes I forget to test certain
things, and I forgot that the protocol choice in PBWrapper is implemented
through a workaround. Also, fixed the installation validation behavior.