SSDM-13456: obis search command now includes recursive search in samples/datasets. Refactored documentation. obis-0.4.2rc1

SSDM-13330: Removed get/set/clear boolean flags, added enum for differentiating these operations. Prepared PhysicalDadaMgmt for implementation of object/collection get/set

SSDM-13330: Added PhysicalDataMgmt for handling data stored in DSS, implemented init command for physical data. Refactored code.