Remove an accidental #include.
Remove an accidental #include.

Maintain sector sizes for all objects, not just for drives.  Some of
this could do with improvement: in particular, we get an error if the
components of an object have different sector sizes.

Clean up some comments.

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