Patchfix release 0.3.0.1

It turns out that even if cabal check shows no warnings, Hackage doesn't accept packages with very old cabal version constraints. So this release bumps that, which in turns makes cabal check actually start to show warnings, so modernise the cabal file as a result.

There are no code changes compared to 0.3.0, so this is a no-op release from the point of view of functionality.

Release 0.3.0

Add the new quecto/ronto/ronna/quetta units. These are very small, respectively very large units, so practical impact is small, but they are valid SI units.

Release 0.2.0

• Incompatible API change to cleanup some initial design decisions:
  the two level FormatOption/FormatMode model is removed, the
  fixed unit of FormatOption is moved to a new constructor
  FormatMode, and FormatOption is removed entirely. This should be
  a simpler API, at the cost of breaking compatibility.
• Fixed issue #3 (No support for negative numbers).
• Worked around issue #1 (Add 'base' unit) by adding a mode that
  disables scaling; it should have the same effect without introducing
  an artificial unit.

Release 0.1.0.2

• Trivial release for compatibility with QuickCheck 2.7 and older
  HUnit packages as found in Wheezy.
• The release switches the test suite to use Cabal macros, which might
  create issues in some cases.
• Fixed issue #2 (Wrong formatting for small numbers in SI mode).

Release version 0.1.0.1

Trivial release updating upper package bounds (for testing), updating homepage/related settings as part of move to github, and fixing a few documentation issues.

Release version 0.1.0

Initial release.