Extending check constraint support to all table constraints

git-svn-id: svn://svn.code.sf.net/p/schemacrawler/code@2746 3243f2e7-4e1b-42d2-9742-d984016aa316
Patch from https://sourceforge.net/p/schemacrawler/patches/5/

git-svn-id: svn://svn.code.sf.net/p/schemacrawler/code@2747 3243f2e7-4e1b-42d2-9742-d984016aa316