Introduce asyncCancel() (defined but incomplete). (dm)


git-svn-id: svn://mielke.cc/main/brltty@7322 91a5dbb7-01b9-0310-9b5f-b28072856b6e
Make async handles more robust. (dm)


git-svn-id: svn://mielke.cc/main/brltty@7323 91a5dbb7-01b9-0310-9b5f-b28072856b6e
Remove the node selection code as it doesn't do what is needed. (dm)


git-svn-id: svn://mielke.cc/main/brltty@7324 91a5dbb7-01b9-0310-9b5f-b28072856b6e