Restore function Html5.Id.get_element (disappeared from interface)
Id.get_element now returns option
Merge pull request #129 from ocsigen/getelement

Restore function Html5.Id.get_element (disappeared from interface)
Tools: option to disable linkall
Merge pull request #135 from ocsigen/linkall

Tools: option to disable linkall
Merge remote-tracking branch 'upstream/master' into ocsigenserver-3.0.0