added version number to dispatch table, and check it in nc_def_user_format() #1635
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Fixes #1599
Fixes #1031
As discussed with @DennisHeimbigner in this PR a version number is added to the dispatch table, and checked by nc_def_user_format().
If the version number is incorrect, nc_def_user_format() rejects with dispatch table with NC_EINVAL.
This is to help ensure that the dispatch table used by PIO and other third party libraries is correct.