setup with experimental libsolv-based dependency solving

Jon Turney
Wed Oct 25 19:19:00 GMT 2017

This has a lot of internal changes, so could use some wider testing. 
Please test.

Changes compared to 2.882:

User visible changes:

- 'Current' is replaced by 'Best' (which is slightly different in ways 
it's difficult to summarize briefly) and 'Sync' (which exposes the 
--force-current option through the UI).  These are modified by a 'Test' 
checkbox, which allows test packages to be used.
- For the handful of packages where the curr: version has a lower 
version number than some prev: (e.g. cscope), the higher version number 
is now preferred.

Internal changes:
- Uses the libsolv dependency solver, rather than a home-made one.
- Add support for 'depends: package (relation version) [...]', in a 
version section in setup.ini
- Add support for 'obsoletes:' in setup.ini, likewise

A big 'thank you' to Ken Brown for helping get this to the point where 
it's somewhat usable.

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