Tasks:

  * See if ob-installdocs can/should handle non-directory non-regular files.
  * Review "IFS=... cmd ..." commands.
  * Review eval commands.
  * Finish ob-checkbuilddeps.
  * Write ob-genchanges.
  * Write manual pages for functions and utilities.
  * Support package signing (requires opkg to be built with GnuPG and GPGME).