DERBY-6228: Add parsing of SQLCARD warnings after next(). Don't commit tx when calling getWarnings(). Fix various locator-release errors when navigating SURs. 

Patch file derby-6228-a.diff. (+ typo fix mentioned in review) 


git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1537881 13f79535-47bb-0310-9956-ffa450edef68