Issue #242 XmlValidator understand noNamespaceSchemaLocation attribute
#261 fixed NPE in Constant check
#262 recreated problem
#262 partially working check for redundant errors
Merge pull request #278 from krzyk/262

#278: pull request #262 partially working check for redundant errors
Merge pull request #275 from longtimeago/242

#275: pull request Issue #242 XmlValidator understand noNamespaceSchemaLocation attribute
Merge pull request #276 from krzyk/261

#276: pull request #261 fixed NPE in Constant check