some change on the format of printed elapsed time
add the basic methods for pardiso
run pardiso in linux
Merge remote-tracking branch 'github/AddPardiso' into AddPardiso
add the mechanism for choosing solver

- NEW : add the parameter, solver
- ENH : solver can be chosen
- ENH : enhance the matrix solver class to use pardiso
debug in linux to run pardiso
Merge branch 'AddPardiso'