Go back to having all info in one rzdb file.

We can still split the rzdb file into a main file and a file data and a details file, but that's only for optimizing the required download size. On the system we always combine the parts back into one rzdb file once downloaded.

committer: J. Ali Harlow <ali@juiblex.co.uk>

Support RPM_INSTALL_PREFIX{n} during uninstall

Test uninstall scripts survive merge

Support empty scripts

Add basic support for uninstall scripts.
RPM_INSTALL_PREFIX{n} is not yet supported and upgrading a package
where an uninstall script changes may need more work to ensure the
old script doesn't get included in the merged set (when it is too
late to remove). I haven't yet tested whether this is a real problem.

Add automatic provides for lua pre-loaded modules

Order the installation and removal of packages correctly so scripts can run

Take advantage of gcc's builtin implementation of ffs under mingw

Fix documentation typo

Add support for topological sorting (needed to order transactions)