Change server setup to comply with Linux-Filesystem-Hierarchy

[albertsgarde]

The repo should stay in user directories and each user should have their own copy (possibly a shared one in /home/shared). The database file should be stored in /srv, while the server binaries and frontend directory should be stored in /usr/local. This means that each time a new version is compiled, the result should be copied to /usr/local.

[albertsgarde]

this is actually a way to separate testing from deployment, so should be done before announcement