Enhancement: Support for setting point_weight_flag and obtype_as_group_val_flag in PointStat and EnsembleStat

[georgemccabe]

dtcenter/MET#2279 added a new point_weight_flag config variable that should be supported in METplus wrappers.
dtcenter/MET#2893 added a new obtype_as_group_val_flag boolean config variable that should be supported in the METplus wrappers.

Both of these options should be added at the highest level of config file context to both the PointStat and EnsembleStat wrappers.

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