The end goal of this cleanup is to have all reports grouped in
subdirectories of the new 'reports' directory.
This first commit moves the standard reports
which mostly involves renaming several modules and targets.
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.
