#152 Template display inherited blocks

[Rob Bodington]

templates can inherit from other templates.
This can be shown on the template diagram, i.e. inheritance being displayed.
Also, the parametric diagrams may refer to the inherited protected properties.

The image maps need to be updated.

The template diagram is straightforward.
However, the parametric diagram will need a rethink, as the map currenly linke to the TYPE not the property.

[Rob Bodington]

This will need rework.
It does not handle the display of a set of inherited templates

/cvsroot/plcslib/plcslib/xsl/common.xsl,v <-- common.xsl
new revision: 1.51; previous revision: 1.50
done
Checking in xsl/templates/template.xsl;
/cvsroot/plcslib/plcslib/xsl/templates/template.xsl,v <-- template.xsl
new revision: 1.43; previous revision: 1.42
/cvsroot/plcslib/plcslib/sys/main_menu.xml,v <-- main_menu.xml
new revision: 1.6; previous revision: 1.5