StGermainBase is required on OS X.
	-no difference on linux.
changes for the updated hydrostatic and winkler force calculations.
fixed a bug of overwriting the initially computed vertical balance.
minor changes
minor changes
Changes made to remove PETSc dependence.
Completed removing PETSc-dependence.
PETSc does not even need to be optional.
Updated to migrate to ParaView as a postprocessing tool: 1. The new snac2vtk writes .vts (VTK XML data file format for structured grids) and .pvts (its parallel counter part). 2. The original was renamed to snac2vtk_legacy.c.
Completely removed the unnecessary python configuration step.
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Minor changes in the Usage.
Removed snac2gmv.
Removed the obsolete snac2gmv.
1. Restored the original functionality of Top2BottomSweep funciton.
2. Removed unnecessary print lines.
Delete the deprecated winkler plugin. A new one will be subsequently created.
1. winkler_G3_* has been renamed to winkler. The official plugin name is "SnacWinklerForce".
2. Makefile.def has been modified accordingly.
Adding the first example.
A copy of GPL added.
Replaced the viscosity model with what's consistent with the manual.
Removed a library dependency that causes error when StGermain is built 
against MPICH2.