Deprecate Gamin/FAM support in favor of libev: the current implementation have problem on SELinux enabled system due to Gamin server startup being triggered by other program, and thus using improper role for Prelude-LML.

Additionally, this will remove a lot of code working around FAM specific issue, and provide Operating System specific improvement for the UDP server socket monitoring feature.

We will also use libev in order to monitor file that are not available for reading on startup: once the file can be monitored, libev will provide us with a notification.

Implementing this functionality should have the side effect of fixing #291.