7Units Version 1.0.0-alpha.1

Added:
- Allowed converting to a sum of units (e.g. 4/3 ft → 1 ft + 4 in), in
  both modes.
- Allowed exponents on units to be non-integer real numbers.
  The resulting unit's exponents are rounded to the nearest integer, and
  the user is warned if this changes the value by more than float error.
- Added more information to the loading-success message, and added
  it to the About tab.

Changed:
- Errors in unit- and dimension-files are shown in popups, rather than
  crashing the program.

Fixed:
- Fixed the encoding of the ± characters used in uncertain doubles.
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