Upgrade sphinx environment to support linkcheck build goal
|Reported by:||fgdrf||Owned by:|
To continuously check the external links in sphinx docs the build goal linkcheck should run every time the sphinx-build has been started (see root/livedvd/gisvm/trunk/bin/install_main_docs.sh).
linkcheck is available since version 1.1 of sphinx and check references, which can be configured by set up a ignore list, for example localhost URL's (see linkcheck_ignore config option).
This would help to avoid outdated references to external resources.