Make docs for dependency graphing more clear.

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Graphs Graphs
====== ======
This page has a parameter that sets the location of a Web Dot Bugzilla can draw graphs of bug dependency relationships, using a tool called
server, or of the Web Dot binary on the local system, that is used :file:`dot` (from the `GraphViz project <http://graphviz.org/>`_) or a web
to generate dependency graphs. Web Dot is a CGI program that creates service called Web Dot. This page allows you to set the location of the binary
images from :file:`.dot` graphic description files. If or service. If no Web Dot server or binary is specified, then dependency
no Web Dot server or binary is specified, then dependency graphs will graphs will be disabled.
be disabled.
webdotbase webdotbase
It is possible to show graphs of dependent bugs. You may set this parameter to any of the following: You may set this parameter to any of the following:
* A complete file path to :command:`dot` (part of GraphViz) will generate the graphs locally. * A complete file path to :command:`dot` (part of GraphViz), which will
* A URL prefix pointing to an installation of the webdot package will generate the graphs remotely. generate the graphs locally.
* A blank value will disable dependency graphing. * A URL prefix pointing to an installation of the webdot package, which
will generate the graphs remotely.
* A blank value, which will disable dependency graphing.
The default value is a publicly-accessible webdot server. If you change this value, make certain that the webdot server can read files from your webdot directory. On Apache you do this by editing the :file:`.htaccess` file, for other systems the needed measures may vary. You can run :command:`checksetup.pl` to recreate the :file:`.htaccess` file if it has been lost. The default value is blank. We recommend using a local install of
:file:`dot`. If you change this value to a web service, make certain that
the webdot server can read files from your webdot directory. On Apache
you do this by editing the :file:`.htaccess` file; for other systems the
needed measures may vary. You can run :command:`checksetup.pl` to
recreate the :file:`.htaccess` file if it has been lost.
font_file font_file
You can specify the full path to a TrueType font file which will be used to display text (labels, legends, ...) in charts and graphical reports. To support as many languages as possible, we recommend to specify a TrueType font such as Unifont which supports all printable characters in the Basic Multilingual Plane. If you leave this parameter empty, a default font will be used, but its support is limited to English characters only and so other characters will be displayed incorrectly. You can specify the full path to a TrueType font file which will be used
to display text (labels, legends, ...) in charts and graphical reports.
To support as many languages as possible, we recommend to specify a
TrueType font such as Unifont which supports all printable characters in
the Basic Multilingual Plane. If you leave this parameter empty, a default
font will be used, but its support is limited to English characters only
and so other characters will be displayed incorrectly.
.. _param-group-security: .. _param-group-security: