Under modern mode, mapproject must acquire -R -J from gmt.history in certain situations

[PaulWessel]

Currently, the NEEDS setting for mapproject.c says

#define THIS_MODULE_NEEDS ""

meaning -R -J are not required for mapproject to run.

However, there are many situations when -R is needed, and if not supplied on the command line we must obtain the most recent -R form the history. That aspect is not implemented yet and hence some commands (e.g., doc_modern/scripts/GMT_mapscale.sh) fails since we do not explicitly pass -R and -J even though those two are required for mapproject to do this work.

I will look at this once more urgent matters like homework grading and department self-study report have been completed...