Changed the resolution of the grid to be 1 meter (instead of 1/2 meter) for the 2nd and 3rd pool configurations.  Fixes #46.
Constrained the grids for the 2nd and 3rd pool configurations to be at the outer edges of the pools, fixes #44.
Replaced usage of HTMLText with SubSupText, which allows for better text positioning.  Fixes #45.
Updated changes.txt
Added labels to grid for pools 2 & 3, fixes #47.
Merged in changes from master for several fixes.