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cd Domain Error and GetLastError Information

cder'' returns information about a cd domain error:
0 0 - no error
1 0 - file not found
2 0 - procedure not found
3 0 - too many DLLs loaded (max 20)
4 0 - too many or too few parameters
5 x - declaration x invalid
6 x - parameter x type doesn't match declaration
7 0 - system limit - linux64 max 8 float/double scalars

cderx'' returns GetLastError and text from the last cd.
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