spandsp logging now passes an opaque pointer to the logging routine, to
increase flexibility. Right now the pointer is set to NULL in all calls.

mod_vlc adding faster response time to files. No longer has a one second delay before audio starts to play.

 * 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>