Merge branch 'release/1.0.0' into develop

* release/1.0.0:
  Release 1.0.0
Mutators return new value

The functions for updating the value of measurement all now return the
new value.  Saves you a separate call to `whatever_get`.
Merge branch 'feature/inc-return' into develop

* feature/inc-return:
  Mutators return new value
Evaluate macro arguments once in fail_unless_equal

Rookie mistake.
Merge branch 'feature/macros' into develop

* feature/macros:
  Evaluate macro arguments once in fail_unless_equal
Set value of derive statistic

We didn't have a `bws_derive_set` function before since derives are
supposed to be counters that never decrease in value.  By only providing
incrementors, we could guarantee that just using the C type system.
But, we already have a use case where we need to fill in a derive
counter from a source that is itself always-increasing, and I don't
really want to play arithmetic shenanigans just to get around the fact
that we don't have a setter.  So now we do!
Merge branch 'feature/derive-set' into develop

* feature/derive-set:
  Set value of derive statistic
Release 1.1.0
Merge branch 'release/1.1.0'

* release/1.1.0:
  Release 1.1.0
  Set value of derive statistic
  Evaluate macro arguments once in fail_unless_equal
  Mutators return new value