observable

[ev-br]

• do check convergence :-). --- first shot at ENH: observable: actually check convergence #13
• checkpointing : serialize/deserialize /pickling -- pickling support at e3cac7e
• verbose binning analysis -- c17626507849e0be9b416dda4b5fe20bdc983af6OK for now, improve later
• include path

Maybe some day:

• serialization to h5 : cf Add reading and writing observable in hdf5 #68
• expose readonly .blocks from python, implement np.array <-> vector utility, use it elsewhere (setstate/getstate/from_blocks etc)