more Validator refactoring

first start at refactoring the validation mechanism

A Validator is now returned by the AccessTable. It has it's own save
method. The entry.php was split up in entry, edit and revert to separate
the

first start at refactoring the validation mechanism

A Validator is now returned by the AccessTable. It has it's own save
method. The entry.php was split up in entry, edit and revert to separate
the different concerns. Validation is only done in entry and the thanks
to the new Validator mechanism, the once loaded access table is reused
in saving.

This will break all kind of stuff. Fixing that is for the upcoming
commits

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Do not hide rows if table is only pid and/or rev

Write last value to multi-table on col change

This is intended to replace pull-request #113

Partly reverting 12fe9b2c - export user again

We need the user to see if there were local changes since the last sync

column aliases need to differ from real column names

Otherwise the grouping is ambigious. In Search() this was the case
already.

introduces getDisplayValue

A way to represent a complex type as a single non-complex type. Usually
this is the same as the rawValue.

Do not export the user either

make new parameter optional

fix importing into a new lookup schema

Set the user explicitly during import

If left unset, it will default to the currently logged-in user

Reinitialize db if $conf['meta'] changed

handle empty rows in Search via new mechanism

adjust for removed option in AccessTable

begin stremalining raw handling #148

This starts implementing the wanted features in the Value and
AccessTable class. Calling classes and tests aren't adjusted, yet

Revert "check rawValue when checking for empty rows #148"

This reverts commit 80d194bedbc09470dbd237eec476a409de84ded0.

That change did not properly take multi values into account

check rawValue when checking for empty rows #148

allow multiple sorts on one line

removed unsupported config options from configparser

those were remains from other output modes in the data plugin but are
not yet supported in struct

make sure lookups aren't assigned to pages

This prevents pattern assignment and will ignore any lookups when
reading the assignments for a given page.

Should probably have some tests

special columns are not available for lookups

safeguard against lookup mixing in Search

We can not join lookup schemas with any other schema on pid. Which means
we can not allow selecting more than one lookup schema in Search.

fix config parsing of multiple schemas

added tostring() method for easier schema debugging

output the key not value for unknown option in ConfigParser