Improving Windows docs (merge attempt 2)

My first attempt had extraneous files and commits. Hopefully this is a clean merge request.

In this branch: I updated the text in docs/howto-make-dlcs.md to have more detailed information for Windows users.

Specific changes (copied from commit message):

• Connecting to the cluster
  • split into Windows/Unix subsections
  • added much more detail on how to configure PuTTY
• Mounting cluster discs
  • updated Windows text for more details on how to map network drives
• Preparation
  • Changed relative path to wine config script to an absolute path, since it wasn't clear where the pbsutils path was and I didn't know if it was on the PATH
• TODO (comment in beginning of file)
  • Separated into "TODO" and "DONE"
  • Moved a few items to "DONE"