Features:
* Added CHM documentation to wheel package
* hdf5io: added support for a progress bar callback in "read_object_list" (this allows implementing a progress dialog widget showing the progress when reading an object list in an HDF5 file)
Bug fixes:
* Python 3 compatibility: fixed `hdf5io.HDF5Writer.write_object_list` method
* data items:
* StringItem: when `notempty` parameter was set to True, item value was not checked at startup (expected orange background)
* disthelpers:
* Supporting recent versions of SciPy, h5py and IPython
* Fixed compatibility issue (workaround) with IPython on Python 2.7 (that is the "collection.sys cx_Freeze error")