1. Removed cyclic reference. Removed field myCommonBlock from BOPDS_PaveBlock;
2. Added data map myMapPBCB in BOPDS_DS. It contains pairs (PaveBlock, CommonBlock);
3. All methods about common block have been shifted from BOPDS_PaveBlock to BOPDS_DS;
4. Test case bugs moddata_2 pro19422_2 has been rewritten to build the correct result.
Test case corrected (TODO removed)