more work on the search. still in debugging state

store the table name without data_prefix in multivals table

this keeps it consistent with everywhere else

fixed loading sqlite helper in assignment screen

made assignment overview a table

I'm not too happy about the links for the delete action, but with the
form wrapped around the table, this was the easiest way.

fixed bugs introduced by making admin components

also show a TOC on both admin pages to easily switch

first go at data searching

allow finindg columns by name in Schema

make more type properties accessible via Column

keep table reference in Column

use namespace and autoloader in all tests

moved more assignment related stuff to the Assignment class

proper checking of assignments

more assignment related stuff needs to be moved to this class

fixed getMenuText method signature

Add an adminpage for schema<->page/ns assignments

Todo: The test if a page is in a namespace with an schema assigned is
not yet implemented.

escape stuff

Split the values based on type, if not array already

SPR-291

first go at better multi editing support

Some minor refactorings

SPR-291

Save Schema-Data of pages for assigned Schemas

some refactoring in the form building

Now the whole form is inserted as a single HTML element. This makes it
easier to correctly position it in the form (the position is determined
dynamically now)

some refactoring in the form building

Now the whole form is inserted as a single HTML element. This makes it
easier to correctly position it in the form (the position is determined
dynamically now) than to have to work with permanently shifting
positions witin the form object. Since we don't expect other plugins to
modify our form this shuld be okay.

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minor name cleanup

also always use protected instead of private as we may need to access
internals during testing later on

use $REV to load old schema data when editing old revision

columns are already sorted. no need to sort again

added filter in getColumns to leave out disabled cols

objects are always passed by reference