authSupportType configurable via system property

BASIC or FORM may be configured via system property
add id attribute on forms

add id attribute on forms for driving tests better
(and remove useless jstl logic related to 'whr' parameter)
remove useless dependencies to jstl
reformatting idp-remote pom

reformatting idp-remote pom (same as for idp)
reformatting federation-webflow.xml source code
simple source code reformatting
complete systests refactoring

authSupportType=FORM now covered by systests,
major refactoring of systests to cover (BASIC/FORM) X (Tomcat7/Jetty8),
improve Jetty8 shutdown,
correcting the configuration exchange between IDP and RP
federation enhancement

continue federation implementation to support delegated authentication
to remote/requestor idp