Fixed inconsistency in use of single and double quotes in load() function...

Fixed inconsistency in use of single and double quotes in load() function using a mix of CMDOWS and XML (CPACS) I/O files.
Fixed addition of T instead of space in timestamp.
Added check on workflow element in CMDOWS while loading to make sure the parameters exists (to avoid unexpected errors downstream).


Former-commit-id: dc7b4f6a06003bd0f603fba427f423e3d262737f