Added rst version of Data_Format file.
Added the Data Format to the toctree of index.rst

Remove the top index page from the TocTree

Updated index.rst to link to the Gallery in the main toctree
Update to conf.py
Documentation updates to source files

Docs now generate using Sphinx-gallery
Update conf.py and .rst files

* Also replaced the TK based uiGetfile with PyQt based version.