Fixed string messages as per comments of tester: - Adjusted message box message when perfoming StabilityStoneCover calculations - Adjusted messages in logger when calculating hydraulic boundary conditions (waveheight and designwaterlevel) Related to Issue [WTI-867] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@6095 5a3db67b-de53-47b5-99c8-a1c30a6650e2