ENH: Added new limitFields function object

@Roger @Prashant - can you confirm this OK to go in? and any test case/updated tutorial that can be provided?

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Details of the new function object:

Limits fields to user-specified min and max bounds

Usage Example of function object specification:

limitFields1
{
    type        limitFields;
    libs        ("libfieldFunctionObjects.so");
    ...
    fields      (U);
    limit       max;
    max         100;
}

Where the entries comprise: Property | Description | Required | Default value type | type name: limitFields | yes | fields | list of fields to process | yes | limit | bound to limit - see below | yes |

The limit entry can take the value:

• min : specify a minimum value
• max : specify a maximum value
• both : specify a minimum value and a maximum value

changed milestone to %v1912

added feature post-processing labels

changed the description

added Ready label

added 54 commits

• 9f52960a...a8ab9b87 - 53 commits from branch develop
• 911fb18c - ENH: Added new limitFields function object

Compare with previous version

I am OK with this.

Does this replace the old functions in fvOptions like limitTemperature, limitVelocity or velocityDamping?

This is applied as a post operation to the calculated fields, not a matrix constraint.

assigned to @mark

added 17 commits

• 911fb18c...69a83695 - 16 commits from branch develop
• 6709f3ef - ENH: Added new limitFields function object

Compare with previous version

mentioned in commit ad82e9c4

merged