Reorganise buttons in profile panel

- Move the buttons of the profile window around to have more sane positions.
- All the buttons affecting the ceiling(s) are now grouped together.
- All the buttons affecting the Information Box are now grouped together.
- The previous icon for "Show calculated ceiling" has been reassigned to
  "Show all tissues"
- A new stand-in button hav been included for "Show calculated ceiling"

Signed-off-by: Willem Ferguson <willem@willem-Precision-M4700.(none)>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>