- debug.c was only used by obdclass, so I moved it there

- some of page.c wasn't used by anything, so I removed those bits; much of
  page.c was only used in one module, so those bits moved there; two functions
  were shared, so now they're in obdclass; page.c is no more.
- stop building and distributing obdfs
- little warning and formatting fixups that I noticed along the way