Reverse some stuff I accidentally committed in the previous commit:
Reverse some stuff I accidentally committed in the previous commit:

- creation of sparse files to speed up the build process. This was
  discussed with phk 2 years ago and he disagreed with this change.
- handling of negative data partition sizes.

Can I have the ... green pointy hat, please?

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase