Trying to convert FEM to FLENS only

Nearly there, just need to fix the linking :(
Readd input data
Still not linking the templates
nothing important
Add gitignore
Completed cg solver linking with fully flens fem.cpp

Need to link gs, but the headers have gone astray.
Finished adding flens to FEM.cpp

Parallel works, serial possibly not.
Merge branch 'FEMasFLENS'