DOC: add new chapters
Update README
DOC: fix typo
DOC: fix typos
Ignore MANIFEST and any rst files in the root directory
DOC: change README.txt
DOC: improve intro
DOC: improve README
DOC: correct typo
DOC: improve intro
DOC: add new sections to Getting Started
DOC: new sections in getting started and improvements in tools
utils.py: add function plot_same_navigation

Can plot several spectra which all share the same axes_manager.
Making it possible to change the navigational position of all the plots
at the same time.
Merge branch 'master' into DOC_reorganize_user_guide
BUG-FIX: the hydrogenic xs were raising an exception when Z<13 and Z>36 because Egerton's original code was not designed to work out of this range
Add correction factor parameters for Na and Mg to the Hydrogenic XSs so that they better match HS XSs
Merge branch 'master' into DOC_reorganize_user_guide
BUG-FIX: utils.plot_same_navigation had wrong variable name
utils.plot_same_navigation: improve docstring
Modify plot_same_navigation: add navigation parameter, rename function

Add navigation parameter which is passed to the individual plot
functions.
Renamed function to plot_sync_navigation