Table prefix is useful where only one DB is possible (cheap hosting).
this way is possible define something like a "namespace"

default is 'oc_'

This is made using em unit instead of pt for font-size.
"New" sizes are relative to the font-size choosen by the user.

Changed 9pt in 0.95em, 8pt in 0.8em and 7pt in 0.7em, tested on Firefox. This should fix zoom in/out in IE.

* Form action not specified
* An input field was not closed
* Made an input field child of a div

Valitating produce a warning

clean the admin configuration form of db related entries and data_dirrectory (as long as we don't move the data when that changes)