Sort-by-column-label-click mostly working.
Added a custom label renderer to display sorting arrows.
Sorting on column label click working well.
Added the filter, sort, and search information to the bottom info pane.
Changed the text bar on the bottom to a status bar.
Further updates to the status bar; made it the actual status bar.
Merge branch 'master' of https://github.com/ldevesine/Calvin into john_dev

Conflicts:
	src/cscience/GUI/Util/__init__.py
Added axes labels and default options for the GraphingOptions Dialog
Improving the graphing tools. Consolidated the PlotOptionsDialog with the PlotWindow, added a legend.
Fixes and additions to plotting tools and UI. Plotting with multiple variant sets of data works now. Except that it kind of breaks the axes labels and tick marks. Doesn't crash though! I'll fix that soon.