Leave it to users to categorize their non-currency commodities. In the
QIF importer default non-classifiable commodities to
GNC_COMMODITY_NS_NONCURRENCY.
It is split into
- /libgnucash (for the non-gui bits)
- /gnucash (for the gui)
- /common (misc source files used by both)
- /bindings (currently only holds python bindings)
This is the first step in restructuring the code. It will need much
more fine tuning later on.