The AddWeight, RemoveWeight, EditWeight and ReplanDive
commands were missing invalidate_dive_cache() calls.
Add them to ensure that the dives are written to git
logs on save.
Fixes#3150
Reported-by: Peter Zaal <peter.zaal@gmail.com>
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>