fix for volumio2 sub-shell sudo permission problems; smaller fixes #140
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add $user to sudoers before calling bt_pa_config.sh
This ensures that $user can run sudo commands without typing any
password. The error message, that previously was "swallowed" by
exc
was: "sudo: no tty present and no askpass program specified".
change quotation of ""arm"" to '"arm"' to prevent confusing syntax
highlightings
add function to restore single saved files
This was needed to restore the sudoers file to its previous state after
temporarily adding $user to sudoers.
fixed wrong variable name BT_NAME to BluetoothName in bt_pa_config.sh
added some config, to-be-compiled source and temporary files to .gitignore to keep commits clean