* enable sha256 in ref server and fix cert validation check 038
* fix localisation issue in authority key parser
* IOP Workshop: ref server doesn't set source timestamp
* Fix localisation issue with cert extension parsing
* fix exception when issuer cert has no auth key serial number/issuer
- Writes to Attributes stored the encoded version of the new values, so ranges were hosed after a write
- Writes to EURange and InstrumentRange are checked for variable range and may fail with BadOutOfRange. Also
- implement more test functions
- implement MultiStateValueDiscreteItem ValueAsText Property
- add Nodes for AccessLevel_xxx_NotUser tests
- keep only one copy of ref server sources