Reenable use of MAP when using Checkpoint files.

[deslaughter]

Is your feature request related to a problem? Please describe.

Issue #2887 reported that restoring a Checkpoint file when MAP was enabled failed when reading the file. This was the result of changes to the registry and removal of a call to MAP_Restart in the FAST_RestoreFromCheckpoint_T subroutine. This feature was working prior to v4.0 when the new registry was introduced. This issue will be used to track restoring this feature for the v4.2 release of OpenFAST.

Describe the solution

• 1. Disable checks which were added to fail the simulation if Checkpoint file writing was enabled and MAP was used.
• 2. Modify the Registry code to ignore C_obj members of structures
• 3. Add the call to MAP_Restart back to the FAST_RestoreFromCheckpoint_T subroutine

[andrew-platt]

Fixed with #3416