Overwrite param values at user defined cells (output points). Mesher.

[NicWayand]

Allow optional input to mesher to define points, a parameter name, and a value to overwrite the default values.

Example: we want to set output points at known stations to clearing or gap canopy type.

[NicWayand]

https://github.com/Chrismarsh/CHM/pull/108 addresses this.