MrSim2 object functional and implemented into several major programs.
  - Several but fixed, mainly keywords not being checked properly
  - Removed asterisks from LHS assignments
  - Divergence of a tensor computed correctly
  - Ohm's law displays -divPe and computes all terms correctly
  - LineCut constructs two points to define the line.
  - ColorSlab can display ranges [max, min]
  - Updates to figures
Checked out programs from master to prepare for MMS flybys.
Distribution functions and eMaps work with the new Sim2 object
 - eMap and eDist use more general language for 2D and 3D simulations
 - MMS Fly-Bys uses a 2D or 3D point to define s/c trajectory, depending on simulation
Other Updates
 - Unit_* methods added to MrSim2
 - GetCell and GetCoord methods renamed to Coord2Cell and Cell2Coord, respectively
 - Added txwci2tindex and tindex2twci methods