Correction jRequest->getDomainName

Dans la fonction jRequest->getDomainName :
 * Inversion des tests sur HTTP_HOST et SERVER_NAME car comme SERVER_NAME est normalement toujours existant, HTTP_HOST n'est jamais utilisé (Exmple : utilisation sur un serveur dernière un NAT, les URL des images, ... sont généré avec des adresses local).
Merge pull request #156 from raymond876/jelix-1.6.x

jRequest::getDomainName(): HTTP_HOST should be tested before SERVER_NAME
Support of a new config file, localconfig.ini.php

This file should be specific to the server where the application
is installed. Instead of modifying the mainconfig.ini.php
to set some parameters specific to the installation,
put them in localconfig.ini.php. Parameters in this file override
those set in mainconfig.ini.php
New class jSoapObject
jSoapClient accepts now jelix shorcut for wsdl files
Debugbar: message to say how to deactivate it