Hyphen as %3D in URLs not converted by Firefox

XWiki since 1.1M4 converts - to %3D in URLs to protect URLs from wiki syntax. But Firefox does not convert these back to - when sending them over the network and some services (like google groups) are not converting them either.

We need to deactivate this conversion at least for external URLs. Since the spec does not force this conversion neither for * I propose we deactivate it for - and * for external urls.