EHN: axis='auto'
EHN: number_of parts and step_sizes = 'auto'
EHN: step_sizes=int
EHN: smaller dim
EHN: Suppress mapped_parameters.splitting option
EHN: replace .squeeze()
EHN: update test
EHN: doc
EHN: stor stacking
ENH: axis='reverse_stacking'
ENH: doc
ENH: tests
EHN: example in doc
DOC: correct doc
Merge branch 'master' into split_as_stack

Conflicts:
	hyperspy/signal.py
	hyperspy/tests/signal/test_tools.py
Merge branch 'master' into split_as_stack

Conflicts:
	hyperspy/signal.py
	hyperspy/tests/signal/test_tools.py
Merge branch 'master' into split_as_stack
ENH: split reset original_metadata
Merge branch 'master' into split_as_stack
ENH: more tests