Added the first version of the DataExplorer module, not fully functional yet.

Added the Heatmap module.

Added the new ISCore module:
- all the other modules now depend on this module, which in turn relies on the ImmPort module
- major reorganization of the architecture: all libraries moved to this module
- core is put into a common library
- common files are grouped into reusable libs
- jQuery downloaded and added as a proper dependency
- for each of the data sets 2 views are added: a default view and a 'full' custom view