* Added HDF5 exporter
* CSV exporter gets (x,y,y,y) export mode
* Updates to SVG, Matplotlib exporter
* Console can filter exceptions by string
* Added tick context menu to GradientEditorItem
* Added export feature to imageview
* Parameter trees:
    - Option to save only user-editable values
    - Option to set visible title of parameters separately from name
    - Added experimental ParameterSystem for handling large systems of
        interdependent parameters
    - Auto-select editable portion of spinbox when editing
* Added Vector.__abs__
* Added replacement garbage collector for avoiding crashes on multithreaded Qt
* Fixed "illegal instruction" caused by closing file handle 7 on OSX
* configfile now reloads QtCore objects, Point, ColorMap, numpy arrays
* Avoid triggering recursion issues in exception handler
* Various bugfies and performance enhancements

Changed FiniteCache which had a bug where calling items() would make it recurse forever with a new LRUCache implementation.

Started new SVG exporter
Merged updates from ACQ4