update release number
BUG-FIX: overwrite was not displaying the right message when running in terminal that without  support for raw_input
BUG-FIX: exporting bss and decomposition was raising an exception
Merge branch '0.7.rc' of https://github.com/hyperspy/hyperspy into edslab
BUG: merging with master
EHN: tidy up misc.eds.utils
EHN: create calibrate_energy_resolution