Add syntax for passing additional parameters into custom TableEngine implementations


git-svn-id: http://h2database.googlecode.com/svn/trunk@4861 e6896862-9d19-0410-bfb3-e9fa5d50e656
improve var name - "id" is a little too generic in this context

git-svn-id: http://h2database.googlecode.com/svn/trunk@4862 e6896862-9d19-0410-bfb3-e9fa5d50e656
fix spelling in comment

git-svn-id: http://h2database.googlecode.com/svn/trunk@4863 e6896862-9d19-0410-bfb3-e9fa5d50e656