Spellcheck / formatting / docs

git-svn-id: http://h2database.googlecode.com/svn/trunk@4818 e6896862-9d19-0410-bfb3-e9fa5d50e656
Referential integrity: when adding a referential integrity constraint failed, and if creating the constraint automatically created an index, this index was not removed.

git-svn-id: http://h2database.googlecode.com/svn/trunk@4819 e6896862-9d19-0410-bfb3-e9fa5d50e656