Transitioned from packdude to packlad.

packlad's keys have to be placed in $BASE_DIR before the first package is built, though.
Bug fixes.

  - The default makefile target name is incorrect.
  - The chat icon is placed under /usr/share.
  - gpacklad does not update the package list.
  - Dillo's homepage is missing.
Changed the packlad keys path.
Moved Ed25519 to a separate package.
Corrected a mistake in the Ed25591 build script.
Bug fix - packlad requires the public key under /etc/packlad.
Added Ed25519 to the chroot environment.