[boost] 5. Use libACE as tutor (was: behond IOStreams)

5. We should heavily lean on the expertise that is condensed in libACE for things like the following: There must be a concept "Event Handler" (the 'call back'). There must be a concept "Acceptor", "Connector" and "Handle" types.

The userbase of libACE is immense, impressive and backed up by a lot of very knowledable and experienced coders. Their input (in the form of libACE) cannot lightly be ignored and we owe it to ourselfs to study their design and implementation thoroughly and learn from it. -- Carlo Wood <carlo@alinoe.com>