TODO:
  * Calculate "Installed-Size" field values.
  * Fix oh-strip.
  * Make oh-strip obey a missing '-l' option.
  * Handle "Architecture" field in oh-gencontrol, opkbuild, and oh-buildopk.
  * Check on file ownership and modes.
  * Finish tar archive handling in opkhelper.
  * Support "Conffiles". [1]
  * Build packages with copyright information and changelogs. [1]

Future Plans:
  * Package signing. [2]

Notes:
 1: Requires change to format spec.
 2: Requires opkg to be built with GnuPG and GPGME.