Running fsck before mounting removable media

[Artem Kachitchkine]

> No, it isn't a good idea to run a fsck check on every plugin time. This is in the
> most cases not needed and the most user don't like to get a fsck check every time
> they plugin their USB harddisk or USB-stick, at least not if you have a big 
> disk and a journaling filesystem. If you always umount the partition correctly 
> there is no need to run always fsck.

It is not a good idea to make this default, but having the ability to do 
so is a legitimate request. There is a need to enable additional actions 
before and after mount, e.g. some users wish to share mounted media over 
the network. Nothing urgent, but worth adding it to the TODO and tossing 
around some ideas in the future.

-Artem.