Title are now in grey by defaults
box-input now have a grey text on white background, submit buttons are now in white whit "blue pool" background
temporary message (popups) are now in grey with "blue pool" background
Box (preference/registration forms and comment input) all have white background now
New typeclass "comment input" for comment input and delete of useless div who contain comment input
Factorize a little by creating a function Templates_common.static_uri
Fix "Eliom_comet: exception InternalError: too much recursion"