Issue order of sv #16 fix

Fixed the order of the statistical values:

Additionally, the model group uses the statistical values to build its contents dynamically.

• I simplified the code at some points where percentile and std was accessed.

==== Simon did a few things, I merged his old branch into this to keep them:

• I (more or less) made Add- and EditModelGroupModal have the same style
• NEW: I added the hover effect to the header checkboxes and resized and aligned them