Provide a parameter to disable the creation of new workflows with the publication workflow macro

The use-case is as follows : sometimes, we deploy the publication workflow along with some amount of customization that allow us to better handle the lifecycle of pages that are under workflow.

In this circumstance, the use of the publication workflow panel (which itself uses the publication workflow macro) is very helpful, as it allows to make sure that every page in a given space has indication on its workflow state. However, we usually have one or two pages that in the space that will have the panel displayed, but that won't be on the workflow. For example : the space WebHome.

In this case, it could be interesting to simply add a parameter to the publication workflow macro "allowWorkflowInitialization" that would control whether the macro proposes or not to initialize a workflow on the current page. If this parameter is set to false (the default being "true" to keep backward compatibility), then a simple message is shown indicating that the document is not under workflow.