🔧 tests fixes

• TC fixes for Knex - DB inserts are now chunked by 5000
• Karma default timeout enlarged to 10s
• OperationPeriod* do not invalidate cache
• Shift* do not race for same ressources (invalidating cache)
  • removing duePoints fetching from ShiftPoints (not used)
  • using cached requests, but clearing cache when rebuilding DB in tests
• set front-end DEBUG for tests at compile time (now DEBUG=xx karma ... is properly evaluated), this relies on a karma-mocha-webpack update
• clear navigation hash in-between two tests - do not serialise server from server to client - update waitFor to not rely on Vue.js and add error message
• Fix isVisible to use computed styles
• Fix some tests to wait for animations/loading