Fix processing of subshape names in STEP in reading and writing.
Replace creating subshapes in Document as tree (invalid) with plain subshapes structure.
Update test cases.
All uses of "MDTV-Standard" and "MDTV-Design" in tests changed to "BinOcaf", and "MDTV-XCAF" changed to "BinXCAF".
Formats changed: .std to .cbf, .dxc to .dbf.
Test groups renamed accordingly:
xcaf: brep_to_dxc -> brep_to_xbf, igs_to_dxc -> igs_to_xbf, stp_to_dxc -> stp_to_xbf, dxc -> xbf/A1, dxc_add_CL -> xbf_add_CL
xml: ocaf_std -> ocaf_cbf, xcaf_dxc -> xcaf_xbf
Test case tests/bugs/modalg/dxf906 was renamed to bug889
Adding test cases to tests/bugs/moddata
Modified expressions puts [checkshape result]. Added command vzfit in end file in folder bugs. Unlocked command coordload in QABugs_3.cxx
Modified test case bugs vis buc60738
Added test cases to modalg and moddata
Added test cases to caf and fclasses
Added test cases to group heal
When test is run interactively, imagedir is set to temporary directory (search order: environment variables TempDir, Temp, Tmp, upper and lower case, in this order, then $HOME/tmp)
Update testing case with imagedir variable
