fix IE upload when Array prototype has been modified

The edittable plugin broke uploading in IE8 (and maybe others) because
the Handsontable script adds a function to the Array prototype and the
uploading script did not properly check that.
allow config presets with installer

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.
fixed template color replacement preview
Quick fix for #765 - ACL checks in the media manager ajax calls

This should be superseded by a proper rewrite of the media manager code
Merge pull request #766 from splitbrain/media_acl_fix

Quick fix for #765 - ACL checks in the media manager ajax calls
icreased message version