audio: add PortAudio version string for debugging

amodem-cli

@@ -169,6 +169,7 @@ def main():
         if args.quiet:
             level, format = 'WARNING', '%(message)s'
         logging.basicConfig(level=level, format=format)
+        log.info('Interface "%s" loaded succesfully', interface.version)
 
         # Parsing and execution
         log.debug(description)

amodem/audio.py

@@ -11,6 +11,7 @@ class Interface(object):
         self.config = config
         self.streams = []
         assert self._error_string(0) == 'Success'
+        self.version = self.call('GetVersionText', restype=ctypes.c_char_p)
 
     def _error_string(self, code):
         return self.call('GetErrorText', code, restype=ctypes.c_char_p)