UI updates, bug fixes:
o Replaced static welcome message with a bsAlert that is dismissable and that disappears after dataset is selected.
o "Reload" button on 'Plot view' panel: Moved to same row as data description to reduce band width by one row.
o Added version string under title
o Bug fix: The refresh button in the header panel was not correctly causing data refresh. Fixed so that both buttons now are equipotent.
o Aesthetic: changed default colour palette to 'Spectral'.
o BSseq data type now returns a value between 0 and 100% instead of 0 to 1.
o Added message for reporting bug fixes
o Bug fix: Gviz: in testing NA locations for polygon error bars, curr_na_pos was not being incremented in case 3. Resulted in infinite loop when NA blocks were separated by >1 bin distance.