support loading both Skew-T and Altitude data

[savelov]

I noticed that in https://github.com/opengribs/XyGrib/blob/master/src/DialogLoadGRIB.cpp#L167 it is not allowed to load both Skew-T data and altitude data, however allowing that enables Skew-T profiles down to ground (see attached screenshots)


I remember using ZyGrib with both, hence suggesting to remove this restriction. I have tried commenting out the logic in source code, it works correctly, however increasing the GRIB file size - may be this is the reason for restricting it?
Please advise

[savelov]

I have made a fix for it in savelov@4a36f23
but not sure the reason why this was originally disabled - may be due to performance issues?

[norulz]

It was a performance issue.
There are other performance control mechanisms on the server now so I will check about removing this.
David