this adds the ability to place a install.conf file next to the
install.php which contains additional config options to be written to
conf/local.php on completion of the installer. The install.conf is
automatically deleted then.

This is useful for automated DokuWiki installers or downloaders that
take care of downloading DokuWiki and then drop the user in the default
install dialog for initial setup. These tools may set up host specific
things options like rewrites, image magic path or file permission
settings in this preset.

server side resizing now needs a security hash which we can' provide in
the installer, yet.

According to the documentation the function was removed in PHP 5.4.0
though it still seems to exist in my PHP 5.4.6 installation.

The position of the option was moved to the end of the list so
the English label "None of the above" will make sense.

allow empty config file to proceed installation as we package default
config empty in first install

as packager may provide empty file in package, to ensure correct
file permissions.

import old patch:
http://cvs.pld-linux.org/packages/dokuwiki/install.patch

See http://forum.dokuwiki.org/post/22120