bash-completion packages

[Elan Ruusamäe]

so,

i've heard the complains about pointless bash-completion subpackages.

let's make the changes:
- add directories to filesystem packages
- drop the subpackages packages

note: requires: bash-completion >= 2.0 should be changed to conflicts: 
bash-completion < 2.0 to support the optional versioned dependency

anyone against? or having some other ideas?

-- 
glen