Fixed Estimated VO2MAX metric

.. to use latest ACSM formula.

.. see: http://blue.utb.edu/mbailey/handouts/pdf/MetCalnew.pdf
UI Nits: Mac Athlete Tab Bar

.. now looks a bit more 'Mac-like'.
UI Nits: Prettify Mac Toolbar for QT5

.. colors match document mode tabbar.
Forgot to increment the DB Schema!
merge upstream into master