- Refactored functionality of ScalarFormatter to be more readable
- Separated logic deciding to perform auto scaling / offset from
  functions calculating the best possible scaling / offset values
- Grouped methods in a logical way (user interaction, inherited, and
  local)
- Removed space before the times sign in the scientific notation /
  scaling. Changed test images to reflect this.
- Changed rcparam test back to original function
- Removed _scientific boolean and the function set_scientific() as they
  were not used anywhere (just grep the original file). The existence of
  the function and boolean might mislead the user that changing this
  bool might affect the plotting.