Secret functionality: --reset-system

[nephros]

The daemon supports a "secret" switch --reset-system which from cursory lookover will

• unapply all patches
• find all RPMs which own files which were affected by patches
• refresh all repositories
• reinstalls those packages

https://github.com/sailfishos-patches/patchmanager/blob/master/src/bin/patchmanager-daemon/patchmanagerobject.cpp#L821

Qs:

• Is this a useful function we want to keep around?
• Does it work as it is supposed to?

It's a nifty thing if it works, but as it does unattended package management I regard it as highly dangerous. And I'm not sure it's still required in the world of PM3 with the preload method.

[nephros]

Additionally, now that we have 32/64 bit mangling, it might fail to find the correct paths, that would have to be looked into.