Tahoe Code SVN development

Changes to temporarily remove Si dimer code - should compile quickly now

Clean up, removing residual surface stress stuff

Add the actual modulus output

Fixed naming of surface driver

Split up SCB modulus calculation using newzfunction for ease of compilation

Committing new files that split up old ddC.c into smaller parcels to enable faster compilation

Split modulus calculation into smaller files using new zfunction, removing and adding appropriate files

Fixed coordinates. Converging. Same answer as before....

Fixed reconstructed unit cell coordinates; does not converge

some new variables are defined.