Update gitignore
Inprove interface.
Rename spec_mesh functions.
Rezidual in norm C.
Rezidual in norm L2.
Fix indexsation for LASPACK. Building matrix A and vector b for gamma2+ case.
Building matrix A and vector b for gamma2- case.
Building matrix A and vector b for gamma1- case. Remove shift. Fix boundary conditions.
Building matrix A and vector b for gamma1+ case.
Add f1 and f2.