- resolved merge conflits
- compiles but some tests are failing

Issue81

		add bool thereHaveBeenExceptions
		write test for taht
			testExceptionsDummyDevice.cc

		writeAfterOpen writes constants to devices
		remove writeAfterOpen in recovery loop
			that should be in writeRecoveryOpen
		extend testProcessVariableRecovery for constants

  - Handle illegal writes to read-only accessors in doPreWrite().
    Otherwise, attempting to write to the recovery accessor would result
    in a nullpointer access.
  - Related test case.

test was broken by its design, which became now evident with the proper initial value propagation

	Ticket #79
	- documentation for addRecoveryAccessor() and getRecoverySharedMutex()

do not read initial values in TestFacility if testable mode is disabled, as this is subject to race conditions then

  - Cleaned up comments
  - Place using-declaration of buffer_2D to class definition so the base
    class name can be omitted in the implementation

forgot to commit latest change: testProcessVariableRecovery now tries to get exception by reading (not writing), currently failing

Need to wait until the internal fan out threads have been launched and acquired the testable mode lock before continuing with app starting and testing to avoid race conditions.