Full Cholesky

Cholesky now fills the full matrix. Although it may seem like an overhead, it helps to pick algorithms (such us Cholesky decomposition, forward and backward elimination) which are better suited for browsing with compressed row format.

Lower and Upper

Cholesky factorization, as well as forward and backward substitution can be done for lower and upper triangular matrices.

Stores matrices in compressed row format.

v0.4

Added file for matrix compression and it seems to work :-)

Cholesky factorization now solves a cute 7x7 system

Besides, I have removed choices "3" and "4" because it's obvious forward and backward elimination work with Cholesky factorization.

Cholesky factorization works as a linear solver

v0.2

Cholesky factorization now solves a linear system.

Gaussian elimination works for solution of linear systems

v0.1

Gaussian elimination works for a whole sytem :-)