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.

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

  - 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

- remove "void ExceptionHandlingDecorator::setDataValidity(DataValidity newValidity)"
- add "void ExceptionHandlingDecorator::setOwner(EntityOwner* owner)" and remove owner setting in constructor

  - add list with shared ptr of transferElements for recovery write
  - add shared mutex

  - Cleanup:

    - Reorder code in Application::createDeviceVariable
    - Separated ExceptionHandlingDecorator constructors for writable and
      non-writable registers
    - cleaned up doPreWrite

FixMe:
These tests have to be revised; they do not test the framework
interfaces but implementation details. They miss checking if
the invalidation reflects on control system variables.

- New flag parameter for ExceptionHandlingDecorator::genericTransfer.
  Method does not invalidate data if flag invalidateOnFailure is set to
  false.
- Write related methods in ExceptionHandlingDecorator set
  invalidateOnFailure flag to false

Changes resolve ticket #57.

Adjust CMakeList to use add_dependency instead of FIND_PACKAGE for DeviceAccess library - now all path to headers are correctly added to the project when ControlSystemAdapter lib and DeviceAccess lib are installed in different directories.

  - First compiling version, tests pass, hope it works...
  - Needs some tweaking

- ConfigReader is in ApplicationCore.h, but was including ApplicationCore.h itself
- Added include guards to ApplicationCore.h, although it's not stricktly needed (all included headers have one). Might speed up complilation because it makes it easier for the parser.

Device support for history