Fixed Python plugin support and some bugs with the conversion to Python 3.4
Fixed linker search paths
Fixed raise syntax
Fixed a missing error code in gcdc.c: describeError()
Added Hookie support
Refactored hookie.c to fix an out-of-range index
Added initial support for adding custom metadata, new channel tables and combination channels
Added initial support for GViewer HDF5 files, events are still missing
Modifications to the test framework