does a ".PHONY" on "install", and this prevents .PATH lookups working for
that target, so "make" unnecessarily considered the files out of date and
rebuilt them every time. (make(1) needs a .NOTPHONY)
- Separate out the TOC dependencies so that a given ${TARG}.type only
depends upon the appropriate ${TARGET}.type.toc. Prevents unnecessary
rebuilding of all the TOCs when you're only generating one target type.
- Remove *.toc.tmp in cleannotes.
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