massive rework of scalarproduct service, splitting into Alice and Bob

git-svn-id: https://gnunet.org/svn/gnunet@34479 140774ce-b5e7-0310-ab8b-a85725594a96
-mark minor todos

git-svn-id: https://gnunet.org/svn/gnunet@34480 140774ce-b5e7-0310-ab8b-a85725594a96
-dead

git-svn-id: https://gnunet.org/svn/gnunet@34481 140774ce-b5e7-0310-ab8b-a85725594a96
-ignores

git-svn-id: https://gnunet.org/svn/gnunet@34482 140774ce-b5e7-0310-ab8b-a85725594a96
-fixing minor compiler warnings

git-svn-id: https://gnunet.org/svn/gnunet@34483 140774ce-b5e7-0310-ab8b-a85725594a96