Listing all possible combinations in the usage as done before would have beed 8 lines just for the save command so I made it one special case, one combined line and a line explaining the defaults in the general waypoint help.
Also tab completion does not work when omitting either tag or name, because it starting to tab complete a position right from the first argument would probably only cause confusion and would be harder to implement because of the variable start position (names can even be numbers so it's impossible to do it 100% correctly)
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