Also read the pin file so that settings in /etc/apt/preferences.d/ will work as well.

I'll see about using pkgCacheFile in QApt::Cache once I can get a feel for how it works/what I'll have to do differently in Cache to maintain binary compatibility, etc.

CCMAIL: 668297@bugs.launchpad.net

svn path=/trunk/extragear/sysadmin/libqapt/; revision=1191149