Pre-Release 1.0.0-beta.1

Compared to version 0.5.0, this release:

- allows conversion to sums of units (e.g. 4/3 ft → 1 ft + 4 in)
- allows non-integer exponents in expressions
- adds the ability to change the UI language
- gracefully handles datafile errors
- adds more information to the loading-success message,
  and adds it to the About tab
- allows the user to not use the default datafiles

No new features will be added until the release of version 1.0.0.
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