ENH: minMax, minMaxMag as functions and field functions
- Global functions are unary or combining binary functions, which are defined in MinMax.H (MinMaxOps.H). There are also global reduction functions (gMinMax, gMinMaxMag) as well as supporting 'Op' classes: - minMaxOp, minMaxEqOp, minMaxMagOp, minMaxMagEqOp Since the result of the functions represents a content reduction into a single MinMax<T> value (a min/max pair), field operations returning a field simply do not make sense. - Implemented for lists, fields, field-fields, DimensionedField, GeometricField (parallel reducing, with boundaries). - Since the minMax evaluates during its operation, this makes it more efficient for cases where both min/max values are required since it avoids looping twice through the data. * Changed GeometricField writeMinMax accordingly. ENH: clip as field function - clipping provides a more efficient, single-pass operation to apply lower/upper limits on single or multiple values. Examples...