Moved surface line and characteristic points test files, which are now generically read, to Common.IO. Related to Issue [WTI-1289]git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@10913 5a3db67b-de53-47b5-99c8-a1c30a6650e2Former-commit-id: 759db45b3ef4635005dde8092de401b3bb9c80b3Former-commit-id: b9a3c322d6637514c0f3766e7fdfda4d17470fcd