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