Got rid of all warning with Intel/Nvidia and Gnu

On branch master

new file:   Const_Mod.f90
modified:   Foul_Mod.f90
modified:   Foul_Mod/Formatted_Write.f90
modified:   Foul_Mod/Integer_To_String.f90
modified:   Foul_Mod/Lower_Case.f90
modified:   Foul_Mod/Split_String.f90
modified:   Grid_Mod/Destroy_Grid.f90
modified:   Grid_Mod/Load_Grid.f90
modified:   In_Out_Mod.f90
modified:   In_Out_Mod/Constants.f90
modified:   In_Out_Mod/Legend.f90
modified:   In_Out_Mod/Plot_Bracket_Left.f90
modified:   In_Out_Mod/Plot_Bracket_Right.f90
modified:   In_Out_Mod/Plot_Circle.f90
deleted:    In_Out_Mod/Plot_Ring.f90
modified:   In_Out_Mod/Plot_Snippet.f90
modified:   In_Out_Mod/Plot_Sparse.f90
modified:   In_Out_Mod/Plot_Sparse_System.f90
modified:   In_Out_Mod/Plot_Square.f90
modified:   In_Out_Mod/Plot_Text.f90
modified:   Solvers_Mod/Check_Solution_Dense.f90
modified:   Solvers_Mod/Check_Solution_Sparse.f90
modified:   Solvers_Mod/Dense/Cholesky.f90
modified:   Solvers_Mod/Dense/Gauss.f90
modified:   Solvers_Mod/Dense/Gauss_Elimination.f90
modified:   Solvers_Mod/Dense/Ldlt.f90
modified:   Solvers_Mod/Dense/Lu.f90
modified:   Solvers_Mod/Dense/Lu_Factorization_Doolittle.f90
modified:   Solvers_Mod/Dense/Lu_Factorization_Gauss.f90
modified:   Solvers_Mod/Incomplete/Cholesky.f90
modified:   Solvers_Mod/Incomplete/Ldlt.f90
modified:   Solvers_Mod/Incomplete/Lu.f90
modified:   Solvers_Mod/Incomplete/Tflows_Ldlt.f90
modified:   Solvers_Mod/Sparse/Cg_Cholesky_Prec.f90
modified:   Solvers_Mod/Sparse/Cg_Diag_Prec.f90
modified:   Solvers_Mod/Sparse/Cg_Ldlt_Prec.f90
modified:   Solvers_Mod/Sparse/Cg_Lu_Prec.f90
modified:   Solvers_Mod/Sparse/Cg_No_Prec.f90
modified:   Solvers_Mod/Sparse/Cg_Tflows_Prec.f90
modified:   Sort_Mod.f90
new file:   Swap_Mod.f90
renamed:    Swap_Int.f90 -> Swap_Mod/Swap_Int.f90
new file:   Swap_Mod/Swap_Real.f90
modified:   grid.ini
modified:   makefile
modified:   makefile_explicit_dependencies

Plots it and makes it operate on L part only

On branch master

modified:   Solvers_Mod/Dense/Ldlt_Factorization.f90

CG from T-Flows work with GPUs, but is very slow!

Preconditioned CG solver works.

(Now I better stop because my wife is getting angry)

Updated the readme file

Organized files in directories.

Added LDL^T Factorization.

Works with variable level preconditioning.

Final touches :-)

Added function to expand matrix.