1. Bug fix in reading old persistent data using FSD_File storage driver
2. Persistence compatible with legacy format was restored for shapes
a. Implemented a storage read / write wrapper for legacy persistence
b. Added DRAW commands to read / write files in legacy format
c. Added test cases for reading / writing operations with checking number of sub-shapes and physical properties
d. Updated related sections of the development guide
Added test case that works in one of two modes:
1) create synthetic document (in old version of OCCT) containing all possible attributes.
2) open the document and compare all attributes with expected values.
Fixed reading of TDataStd_NamedData, TDataXtd_PatternStd, and PColStd_HArray2OfReal.
Point and curve representations are created even from NULL geometry handles.
The code is simplified by abandoning usage of templates from StdObjMgt_ContentTypes class for persistent data elements.
Fixed SetAsciiString Draw command failed when the target label contained NamedData attribute.
