Revision 1191219

Use libapt-pkg's pkgCacheFile for a bunch of cache-related stuff inside QApt::Cache, rather than rolling our own. This results in the nice loss of 51 lines of code.
The class will stay due to the trustCache stuff it implements (and obviously binary/API compatibility) Whenever the need arises for a QApt2 (API break) this will likely become a thin(er) wrapper over the pkgCacheFile, with its main objective being to provide a Qt-style API. (Hopefully a trustCache solution will make it in to APT in the meanwhile, so that we and synaptic don't have to have two imlementations)

But, in the meantime, less stuff to maintain/worry about breaking. :)

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