Avoid wrong result in massageFormValues()

Problem/Motivation

When using the ComplexWidget, the data in massageFormValues() is malformed.
The data from the sub elements are appended.

Steps to reproduce

Proposed resolution

When parsing the OfficeHoursTable, set

 $element['#processed'] = TRUE;

, to avoid the subsequent running of processTable (again).

Remaining tasks

Thoroughly check if there is omsething wrong with OfficeHoursTable.
Or perhaps OfficeHoursWeekSlot or OfficeHoursBaseSlot.

User interface changes

API changes

Data model changes