Create BoostLibrary for a library's info.
Extract some methods dealing with library details.
Use $info parameter for BoostLibraries methods.
Clean up module details.

Now set when BoostLibrary is constructed, so the data should always be
correct.
Remove 'update-version' from BoostLibrary details.

It really shouldn't be stored in BoostLibrary at all, but it makes it a
tad easier to have the object readily available.
Clean up some library details handling code.
Script to read in maintainers from old versions.

A bit of a one-off script, but keep it around for now.