Validation report / Improve XML validation service

[fxp]

Currently xml.metadata.validate return complex XML document not really usable for other applications (eg. JS widget). It requires to deal a lot with namespaces and complex Schematron Validation Report Language (SVRL) format.

<geonet:report xmlns:geonet="http://www.fao.org/geonetwork" geonet:id="43">
      <geonet:xsderrors>
        <geonet:error>
          <geonet:typeOfError>ERROR</geonet:typeOfError>
          <geonet:errorNumber>1</geonet:errorNumber>
          <geonet:message>cvc-datatype-valid.1.
...
 <geonet:report geonet:rule="schematron-rules-inspire">
          <svrl:schematron-output>
<svrl:fired-rule context="//gmd:MD_DataIdentification|    
//*[@gco:isoType='gmd:MD_DataIdentification']|    
//srv:SV_ServiceIdentification|    
//*[@gco:isoType='srv:SV_ServiceIdentification']" />
            <svrl:successful-report ref="#_55" test="not($noResourceAbstract)" 
location="/*:MD_Metadata[namespace-uri()='http://www.isotc211.org/2005/gmd']
[1]/*:identificationInfo[namespace-uri()='http://www.isotc211.org/2005/gmd']
[1]/*:MD_DataIdentification[namespace-uri()='http://www.isotc211.org/2005/gmd'][1]">

              <svrl:text>

This patch produce a much more simple output with same informations. The format is :

<rules>
  <rule group="xsd" type="error" id="">
    <title/>
    <details/>
    <msg/>
  </rule>
  <rule group="schematron-rules-XYZ" type="success|error" id="" ref="#_1">
    <title/>
    <details/>
    <msg/>
  </rule>

xml.metadata.validate was added in r6971 (trunk only). Only the JS widget is using that service probably.

[fxp]

r7242