New features:
* HDF5 serialization (HDF5 reader/writer):
* Added context manager
* Added convenience methods `read` and `write`
* Added convenience methods `write_object_list` and `read_object_list` to save/restore objects implementing DataSet-like `serialize` and `deserialize` methods
* Datasets I/O (HDF5/ini): None values (unset items) can now be saved/loaded for FloatItem, IntItem and BoolItem objects
* disthelpers: added option 'exclude_dirs' to 'add_module_data_files' and 'add_module_data_dir' methods
* Added slider support for FloatItem objects (contributor: julien.jaeck)
* (Issue 21) Added option 'size' in dataset `edit` and `view` methods to resize the generated dialog box (size may be a tuple of integers (width, height) or a QSize object)
Possible API compatibility issues:
* guidata now requires Python 2.6 (Python 2.5 support has been dropped)
Bug fixes:
* DataSet objects (de)serialization: fixed HDF5 reader/writer for FilesOpenItem and FloatArrayItem serialize/deserialize methods
* Fixed DataSet userconfig read/write test
* StringItem/ColorItem: fixed unicode/str issues in deserialization methods
* Added support for strings encoded in file system charset to avoid an error like "String %r is not UTF-8 encoded" when trying to set an item to a string value (path) obtained with a file system command
* configtools/image paths: handling file system encoded paths
* (Issue 14) Restored compatiblity with PyQt v4.4