Add interface for SQL constants

git-svn-id: https://svn.52north.org/svn/swe/main/SOS/Service/branches/52n-sos-400-refactored@20894 9b2695e2-e135-4693-8c03-170fd80ef316
Fix bug in database model script creation when another schema is used then the default (public).

git-svn-id: https://svn.52north.org/svn/swe/main/SOS/Service/branches/52n-sos-400-refactored@20895 9b2695e2-e135-4693-8c03-170fd80ef316
Add schema 'public.' to tables.
If another schema is used, replace 'public' with the schema name.

git-svn-id: https://svn.52north.org/svn/swe/main/SOS/Service/branches/52n-sos-400-refactored@20896 9b2695e2-e135-4693-8c03-170fd80ef316