[sailwave] columns sequence

Hi Roberto

Is it possible to modify le columns sequence?
I need the NAT column immediatly before the Sail # column.
As by Appendix G, every boat of an ISAF International Class or
Recognized Class shall carry the NAT code (national letters) placed
above the sail number, so may be useful to draw them togheder.

This is done in the uploaded 1.49, the Nat fields also has a complete list
of MNAs now.



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