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
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