rename PageStore#removeRecord to removeFromCache, makes the other code much easier to understand

git-svn-id: http://h2database.googlecode.com/svn/trunk@4925 e6896862-9d19-0410-bfb3-e9fa5d50e656
return value from this method not used, so drop it

git-svn-id: http://h2database.googlecode.com/svn/trunk@4926 e6896862-9d19-0410-bfb3-e9fa5d50e656
Fix corruption resulting from a mix of the "WRITE_DELAY=0" option and "SELECT DISTINCT" queries


git-svn-id: http://h2database.googlecode.com/svn/trunk@4927 e6896862-9d19-0410-bfb3-e9fa5d50e656