#2064: Input Elemente die als JSON response 'value=false' bekommen, zeigen 'false' an.

#3253: STORE_TYPO3: steht waehrend Update / Save nicht zur Verfuegung - wird aber benoetigt. Bsp: feUser, beUser, pageId, ...

Thought that problem of #2064 is based on #3253 - that was wrong.
#3253 implemented, but not heavily tested.

#2064: problem was that for a non existing tablecolumn, has been searched for a default value - which obviously does not exist. In AbstractBuildForm.php, Line 419, a check implemented if the current FormElement is an existing tablecolumn. If not, do not change the empty value.

FormAction.php, FillStoreForm.php, Store.php, QuickFormQuery.php, Save.php: Refactor setVarArray() to setStore()

#3253
FillStoreForm.php: If there is no STORE_TYPO3, get the old values from SIP: CLIENT_TYPO3VARS.
Store.php: new function fillTypo3StoreFromSip(), copyT3VarstToSip()