pruned directories and got rid of some old cruft that we don't need anymore
fixed up CMakeLists.txt to handle missing pti08.xml file
fix improper use of abs() to avoid compiler warnings;
more complete interface to PETSc direct solvers; 
add a matrix inversion test program
fix improper use of abs() to avoid compiler warnings;
more complete interface to PETSc direct solvers;
add a matrix inversion test program
Merge pull request #1 from wperkins/master

fix abs() warnings; add matrix inversion test program
Fixed a bug in some of the vector size routines. No return statement for some
functions that return an integer value. This apparently wasn't a problem for GNU
compilers but showed up as a bug for intel compilers.
Merge branch 'master' of https://github.com/GridOPTICS/GridPACK
Synching up with other changes
merge recent changes from master