Module location

Howdy,

I just started to wonder where to place our modules. Formerly we had 
`disk_scanner/{fs,partition,session}', but since the interesting 
functionality for file systems will be implemented in the file systems 
modules themselves, and those will probably stay in `file_systems' 
(even if turned from add-ons into modules), we perhaps want the modules 
for partitioning systems in `partitioning_systems'.

Opinions?

CU, Ingo