align by default

[gdementen]

• LArray.__binaryops__
• LArray.__get/setitem__
• LArray.equals/LArray.eq
• LArray.append/prepend/extend/insert
• sequence
• stack
• concat
• clip
• ufuncs involving several arrays (where, ...)
• ipfp
• random.normal, random.uniform, ...

in fact most of these will come for free if we change "broadcast_with" and "make_numpy_broadcastable"
to do alignment in addition to broadcast. Unsure if we need an option which is True by default, or do it unconditionally.

[gdementen]

Note that alignment should not happen by default for anonymous wildcard axes, otherwise it will never fail but will silently output junk which is annoying at best, a grave problem at worst. It should be possible to manually trigger alignment for those though. For anonymous non wildcard, I am unsure.

[alixdamman]

This somehow related to #274 : we can add an option like xarray does.