rangecheck command line option

[Huw Lewis]

Axel suggests including a '-no_ranchk' command-line option for tools such as ropp_fm_bg2ro_1d to switch off rangechecking on writing output (see attached).

Axel writes:

I think this is very important, in particular when you work with large data sets (as I do). I regularly concatenate them into one archive per day or month, and this is not possible when the number of levels changes. So I suggest to include this in an updated ROPP version.

This could be implemented in a similar way in other stand-alone tools.