Pass installation-count to scripts

Set RPM_INSTALL_PREFIX{n} in preun as well

Formally fork in preparation for release

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