Contextual menu row number translation fixed.

The row number was not translating through the
model, which is the proper way.
Added a method for checking tables to FormFactory.

A new method for checking whether tables have
been loaded, and loading them if they haven't,
has been added to the FormFactory.
Vectorial and Alph table handlers homogeneized.

First step before refactoring them into a
hierarchy.
FormFactory transformed in a true static factory.

Now we can register a default FormFactory and it can be
accessed in a static way. Designed for making the handlers
less coupled with the actual forms.
Use the static Form Factory.

Now we register the FonsaguaFormFactory as
the default one and make all the calls through
the superclass. This step is prior to making
many of those calls in the handlers in a generic
way.
Table loading code moved to the factory.

Also removed a now redundant method from Abstract-
SubForm.
Table and layer loaded checks moved to handlers.
New hierarchy for simple table handlers.

Now we have a BaseTableHandler which is
extended by Alphanumeric and Vectorial ones.
Vectorial contextual menu moved to navtableforms.
Basic table handlers moved to navtableforms.
Factory methods for creating forms by layername.
Updated to latest navtableforms.

Now we don't have to create singleton forms
and pass them when reloading NN rels handlers.