Some work on showing/hiding a dock area (#149).
Some minor cleaning up.
Improved our showing/hiding of docked widgets (closes #149).
Removed from our CellML API plugin all the bits that we don't actually use.

One of the reasons is that the latest version of CIS now comes with
LLVM statically linked to it and we just don't want that.
Upgraded the CellML API from version 1.12 to the latest snapshot available (6 May 2013). Also, a slight improvement to the retrieval of binary files.
Some minor cleaning up.
Commented out a few CellML API related things which break our Windows build (and are not necessary for our use of the CellML API).
New snapshots.
Created an empty preferences window (#193). Also some minor cleaning up.
Some minor cleaning up.
Some minor cleaning up.
Done with un/selecting a category of plugins (closes #192).
Merge branch 'master' of git+ssh://github.com/opencor/opencor

Conflicts:
	src/plugins/api/CellMLAPI/CMakeLists.txt
	src/plugins/api/CellMLAPI/include/IfaceCIS.hxx
	src/plugins/api/CellMLAPI/include/IfaceCeLEDS.hxx
	src/plugins/api/CellMLAPI/include/IfaceCeLEDSExporter.hxx
	src/plugins/api/CellMLAPI/include/IfaceCellML_events.hxx
	src/plugins/api/CellMLAPI/include/IfaceDOM_events.hxx
	src/plugins/api/CellMLAPI/include/IfaceSProS.hxx
	src/plugins/api/CellMLAPI/include/IfaceSRuS.hxx
	src/plugins/api/CellMLAPI/include/IfaceTeLICeMS.hxx
	src/plugins/api/CellMLAPI/include/Ifacexpath.hxx
	src/plugins/api/CellMLAPI/include/cellml-api-cxx-support.hpp