* break out modules
 * conform to FHS
 * support CentOS v5

The idea here is that the config files in the module directories will
serve as the canonical documentation of all module configuration
options.

Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

The former fixes a strange "bug" with hfcsusb, where a b-channel deactivation
on a inactive channel (caused by a reset cycle) would cause the port to
lock up and stop processing events.

NOTE: this still needs to be investigated further, but this workaround will
      at least prevent it from breaking completely.

We'll now keep track of the channel activation state and not send any
PH_ACTIVATE_REQ / PH_DEACTIVATE_REQ requests, if the channel already has the
desired state.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

Wait till the channel is actually ready to send data.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

Use POLLIN on the socket instead, the b-channel should be able
to write when there is something to read.

Several other projects handle it this way, e.g. libosmo-abis.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

Only used by misdn_read(), so move it right in front of that one.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

For diagnostic / debugging purposes.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

         The token count needs to be updated after the master session token is cleared
         and before checking for other tokens

Is this really needed?

Luke Weber reports that OS X's sed utility is broken.

Thanks to Kyle A. King for pointing this out and to William King for
collaboration.

Signed-off-by: Travis Cross <tc@traviscross.com>