- Add basic functionality to support collection on network shares.
There is no autodetection, you have to give the mount path and say it is a network share.
The collection will be considered available if the directory is not empty.
The identification in the database is done via mount path.
As usual we are free to add other means of identification is they are available in the future.

- Extend checkLocation (and add checkNetworkLocation) to always provide meaningful information and a good icon symbolising the kind of storage