Tasks:

  * ob_get_system_path() and ob-installplatconf are wrong.
    - ob_get_system_path() should print both possible directories.
    - ob_get_system_path() needs to use the upstream version number.
  * See if ob-installdocs can/should handle non-directory non-regular files.
  * Review "IFS=... cmd ..." commands.
  * Review eval commands.
  * Finish oh-checkbuilddeps.
  * Write ob-genchanges.
  * Write manual pages for functions and utilities.
  * Support substitutions in control fields.
  * Support package signing (requires opkg to be built with GnuPG and GPGME).