Expose more functions in IrminCLI (to make it easier to extend the command-line tool if needed)
Fix loading of local path when configured in the IRMIN variable
'git clone repo' is now much more sensible to use
Turn-on -bin-annot

(seriously ... this complicated ... and this much new code ?)
Fix import of Git objects

Need to always import the blobs first
Add the availability to clone/fetch/push to/from any backend type

So now you can fetch an in-memory Git store.

There are some issues if the serialization of both backends is different -- that's fixable though