Added context menu item for piping calculation groups which can be used to remove all calculations within a group. Added the creation of this context menu item in the RingtoetsContextMenuBuilder / RingtoetsContextMenuItemFactory, so that it can be reused in other failure mechanisms if desired. Related to Issue [WTI-489] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@4641 5a3db67b-de53-47b5-99c8-a1c30a6650e2