Major Updates to mrVista

This release includes a major update to mrVista and should be release in lock-step with pull request #3 on vistatest. 

The updates include the following:

- Changes in the method of saving and loading tSeries data. tSeries will now be loaded directly from a nifti file (with the location of that file saved in the dataTYPES global variable) and tSeries will now be saved as an entire nifti, one scan at a time. That is, all of the functions that call savetSeries has been changed to reflect this and only call savetSeries once they have bundled all of the slice data together.
- Large updates to the functionality of viewGet and viewSet, including splitting out viewGet/Set into sub-files and adding the ability to request 'help' from viewGet and viewSet.
- Creation of a migration tool used to update a previous session to the new codebase.
- Changing the orientation from ARS to PRS (i.e. flipping the head on the y axis).