Revision 3539

Instead of using remote_coupleBlock, extended ST to include 
the intersection of full ST set and set of all cols in 
mainBlock + col_coupleBlock for each row in row_coupleBlock.
The implementation of this is in file 
"SystemMatrix_extendedRows.c"

Also fixed a few bugs in CIJPCoarsening. 

Now the AMG implementation until CIJPCoarsening has passed 
a set of tests.