Refactored ConvergenceParser so that reading the actual database is a separate component which can be used by other parsers. Related to Issue [WTI-1203]git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@9077 5a3db67b-de53-47b5-99c8-a1c30a6650e2Former-commit-id: 79845e25d1076d2f49ecc92abdca1f81f9e40cb6Former-commit-id: bd2b703ac9c8ab7a92269a5edc1827d78d79347b