Mutil: Created shared constant header file, fixed M_MISSING_VALUE constant.
The msharedconstants.h header file can be used to define constants for use in both, GLSL and CPP code.
The M_MISSING_VALUE and MISSING_VALUE constants were extracted to that file. They were changed to be equal to -infinity for float32 values.
This should also fix issues with interpolation of PressureLevelVolume scalars, where one value is a missing value.
Edited by Thorwin Vogt