Removed now unused functions.
Removed now unused functions.

Removed
-------
* Removed unused functions that dynamically generated method for
  ModelDataFields class.

ManuSchmi88/landlab,Carralex/landlab,csherwood-usgs/landlab,decvalts/landlab,cmshobe/landlab,laijingtao/landlab,RondaStrauch/landlab,cmshobe/landlab,csherwood-usgs/landlab,amandersillinois/landlab,Carralex/landlab,amandersillinois/landlab,SiccarPoint/landlab,ManuSchmi88/landlab,Carralex/landlab,cmshobe/landlab,SiccarPoint/landlab,RondaStrauch/landlab,landlab/landlab,landlab/landlab,landlab/landlab,decvalts/landlab,laijingtao/landlab,RondaStrauch/landlab,ManuSchmi88/landlab