Implement CacheDB for source packages in apt-ftparchive
add test for binary cachedb and contents generation
refactor to make OpenFile/OpenDebFile more robust
ensure clean works
refactor _InitQuery()
ensure "--db" also works with the new srcpkgdb
initialize Verify in second pkgAcqIndex constructor

gcc reports in testcase ./test-bug-596498-trusted-unsigned-repo:
apt-pkg/acquire-item.cc:1059:7: runtime error: load of value 234, which
is not a valid value for type 'bool'

This happens as the bool Verify is initialized only in one of the two
constructors of the pkgAcqIndex class. It isn't a problem through as the
verification controlled by this flag is optional and used to fail early
on garbage files (like network portal pages) instead of later on in the
hashsum verification or while parsing (the then untrusted) file.

Reported-By: gcc-4.9 -fsanitize=undefined
Revert "add bash completion for the "apt" command"

This reverts commit 697c9314c8ba24f3e393b5de11a3fad7adae4bfc.

Conflicts:
	debian/rules
prepare release 1.0.3
Merge remote-tracking branch 'donkult/debian/sid' into debian/sid
Merge remote-tracking branch 'mvo/feature/apt-ftparchive-srccache2' into debian/sid
show progress in run-tests
Merge remote-tracking branch 'upstream/debian/sid' into bugfix/update-progress-reporting
check for UnfetchedReleaseFiles when calculating the update percent value