CLN: Move methods to appropriate sections
BUG: Use public API when resetting bounds
TST: Resetting DataRange2D bounds propagates
MNT: Remove unused, untested private _*_setting attributes
TSTBUG: Python 2.6 lacks assertTupleEqual
Merge pull request #188 from enthought/fix_datarange2d_bounds_reset

DataRange2D can become inconsistent with underlying DataRange1D instances