Phasefield fix / ThunderEgg cleanup

[scottaiton]

Phasefield wasn't converging because I switched from using BiCGStab to CG for the patch iterative solver, and never added an option for switching between the two. Phasefield still converges with the BiCGStab patch solver.

• All ThunderEgg solvers now have CG as an option for the patch solver.
• Renamed patch-bcgs-max-it and patch-bcgs-tol to patch-iter-max-it and patch-iter-tol since these are now options used for iterative patch solvers
• Removed the redundant patch-solver-type option used in the star patch operator and switch to the patch-solver enum option
• Iterative solver now only outputs on rank 0
• Fix bug where the number of equations was being set incorrectly for ThunderEgg vectors
• Fix bug where the number ghost cells for ThunderEgg was hardcoded to 1 instead of using mbc. This was causing patch data to be misread in the iterative patch solvers.

[scottaiton]

Things should be fixed now with the latest ThunderEgg