Tidy up misc
Tidy up misc a bit more
Clean up the user namespace
Organize misc.utils_varia
Merge utils_varia -> utils and move xmlreader to io
Add new mapped_parameters.signal_origin attribute and new Simulation and ImageSimulations signals. Also improve the way Hyperspy assigs Signal subclasses: now it is fully determined by record_by, signal_type and signal_origin. Added tests
Merge branch 'ENH_tidy_utils' into ENH_signal_type

Conflicts:
	hyperspy/misc/utils.py
BUG-FIX: add missing dependencies
Remove unnecessary import
Style corrections
Rename Signal._get_signal_dictionary -> _to_dictionary, new Signal.rollaxis method and (unfinished) move of to_spectrum and to_image to Signal
AxesManager can be indexed using index_in_array by passing complex numbers
New AxesManager indexing using complex integers
Signal.to_spectrum uses new AxesManager and Signal syntax. Signal.to_image in unfinished state.
Make  work
New Signal methods: set_signal_type, set_signal_origin, as_image, as_spectrum. The old to_spectrum and to_image functionality is retained in the correcponding Image and Spectrum subclass methods.
DOC: document the way Hyperspy assigns subclasses based on mapped_parameter attributes