detect also wired audio devices

Merge pull request #9 from allspeak/develop

version 0.4.2.15: can change settings of a test vocabulary + detect wired audio device…

pre release. VersionCode #13. bluetooth headsets

manage bluetooth headsets
reports voice amplitudes during recordings

pre release. VersionCode #12

improved recognition techniques
simplified interface

pre release. VersionCode #9

• new simplified nets labelling
• added vocabulary errors' recovery processes

pre release. VersionCode #8

contains a simplified version of the training process. Just show two net types, one derived from pure user data, the other adapting a common net.