all elements completed

- all coh elems tested and corrected; one big error is with the
interface module cohesive law, when calculating the
Gsc=func(Gtc,Glc,Gt,Gl), division by zero occurred when both Gt and Gl
are zero (pure Mode I opening)
- Paraview can produce animation, output file name must start with a
letter
- output module completed, but still can be improved; book-keeping with
subroutines can be useful
- module inclusion & dependency maps updated

next: clean-up output module, think about x-version
code block project