Release 1.0.0

This release marks the completion of all major intended features of
7Units.

At this point, 7Units has an official public API which will only be
changed backwards-incompatibly when the major version increments.

Additions:
- Allowed conversion to a sum of units (e.g. 4/3 ft → 1 ft + 4 in).
- Allowed exponents on units to be non-integer numbers.
  The resulting exponents are rounded to the nearest integer,
  and the user is warned if this rounding changes the value
  by more than normal floating-point error.
- Added the ability to change the language of 7Units's UI.
  This does not affect the names of units, prefixes and dimensions.
- Added more information to the loading-success message,
  and added it to the about tab.
- Added the ability to not use the default data files.
- Added the ability to generate Javadoc automatically.

Changes:
- Errors in unit/dimension files are shown in popups,
  rather than crashing the program.
- Significantly increased number and coverage of automated tests.

Fixes:
- Fixed encoding of ± character in values with uncertainty.
- ExpressionParser uses the correct order internally.
  Note: this failure was only visible if you call the submethods;
  the public method fixed the problem on its own.
  This was fixed primarily to improve testing.
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