Revision 3817

Now AMG is working. With this working version, a few changes have been
made to the code outside the range of AMG: 
1) in Distribution.c: the way used to generate random seed depends on
the problem size. Sometimes (when the problem size is power of 2), the 
random seed will ends up not working (not diverse). Modification has
been made to fix this.
2) in addAbsRow.c: Paso_SparseMatrix_maxAbsRow_CSR_OFFSET0() modified.

There are still problem with the smoother. The case handler for 
block_size > 3 is not right.