Set reuse address option (fixes #1043)

When the server is killed there may still be client-sockets connected in
the TIME_WAIT state, causing the bind() call to fail. With the
REUSEADDR option we can reuse the address immediately unless another
process is actually *listening* on the same address.
that we want to reuse the address
Verbose name of Assignment inserted, fixed #1036

It is neccessary to refresh the database table for the content types, e. g. by deleting the database and runing syncdb.
Merge pull request #1053 from andkit/fix-1043

Set reuse address option (fixes #1043)
Merge pull request #1057 from normanjaeckel/TransAssignmentString

Verbose name of Assignment inserted, fixed #1036
Sort requirements, fix #1031.
Add tests according to issue #931.
Merge pull request #1058 from normanjaeckel/Tests_931

Add tests according to issue #931.
Merge pull request #1056 from normanjaeckel/SortRequirements

Sort requirements, fix #1031.
Merge remote-tracking branch 'openslides/stable/1.5.x'