and extraction of zip distfiles via a new helper:
unzip-extraction.sh.
When a new template uses extract_sufx=".zip" and the unzip command
is not found on PKGFS_MASTERDIR/bin/unzip, the unzip package will
be installed automatically.
Also add jasper-1.900.1 template that uses a zip distfile.
--HG--
extra : convert_revision : a979bdd3aef82d64e490606c21aa8f557d76fdbd