Sparse rappresentation of Mass and Stiff matrix
System matrix now in sparse rappresentation and sparse solver method now available
Added Sparse QR and Choleski solvers
Functor locMass1 added
Added functors locStiff1,locStiff2,locMass2 and globalFem compatible
R / C++ native interface added, Rcpp no more used
Added benchmark script and deleted not used libraries
Reorganized files, integrated create_basis with mesh_generator
File reaorganization
File reorganization
Merge branch 'sparse' of https://github.com/OldFoxes/SSR into sparse
Added file src
README added
Added empiracal complexity Rscript
Added method for evaluating solution in generic points of the domain
Chenged eval function for R interfacing
Added R interface for eval_FEM_fd
function eval debugged
Second encounter version
Added plot.FEM