ENH: Remove trivial offsets from string representations.
Merge branch 'master' into fix/no-print-offset

* master:
  ENH: Document CHANGES.
  ENH: Make the parser handle offsets.
  ENH: Special-case all weird labels so all units can be round-tripped through the parser.
  BUG: Add S for Siemens.
  BUG: numpy changed how vectorize() keeps the original function.
  BUG: Clean up unit parser context.
  BUG: Fix the definition for PPG.
  turn off the deprecated API
  provide (PyArrayObject*) casting for arrays passed to PyArray_DATA
  pyArray_DOUBLE -> NPY_DOUBLE
  NPY_IN_ARRAY -> NPY_ARRAY_IN_ARRAY; NPY_INOUT_ARRAY -> NPY_ARRAY_INOUT_ARRAY
Document CHANGES.
BUG: Fix doctests again.
Merge pull request #27 from enthought/fix/no-print-offset

ENH: Remove trivial offsets from string representations.