clock.cabal: break up lines of extensions field.
Avoid haddock warning by exporting nsec,sec with TimeSpec.
Num instance for TimeSpec.
Add `diffTimeSpec`.
Simpler Ord instance for TimeSpec.
Use pre-field docstrings, rather than post-field docstrings, wrap.
Inline (|.) and (|^).
Rename csec/ to more standard cbits/.
Use alloca instead of malloc. Much more efficient.

See [GHC manual](https://www.haskell.org/ghc/docs/latest/html/users_guide/ffi-ghc.html)
concerning efficiency claim.
Merge pull request #10 from mboes/simple-cleanups

Simple cleanups
Merge pull request #11 from mboes/timespec-num

Define a `Num` instance for `TimeSpec`.
Bump version
Merge pull request #12 from nilcons-contrib/fix-version

Bump version