Make the 'Feature' field input mandatory for node events

[PBoissier]

When an operator enters an event on a NODE, it should be possible to make the 'Feature' field mandatory.
The ability to define the mandatory aspect should be available in the WebObs configuration.

[PBoissier]

Implementation proposal :

• NODES.rc

In the NODES.rc configuration file, add :

EVENTNODE_FEATURE_MANDATORY|NO

'NO' (by default) or 'YES'

• vedit.pl

In the context of editing an event (not a project) :

if (!$isProject) {

Add an argument to the JavaScript function postform() :

function postform(isFeatureMandatory) {

If the value of the argument is 'YES', then make selecting an item from the 'Feature' list mandatory.