#17 Decode "@" sign via X/26 packets according to EN 300 706

[Stefan Pöschel]

The ETSI EN 300 706 V1.2.1 introduces an additional way to transmit the @: To write the G0 character 2/A (*) without a diacritical mark via X/26 packets. Please see table 35, note 3 in the spec for the Latin G0 case; the other G0 sets are affected as well.

This patch adds support for this further way to encode the @.

[Michael H. Schimek]

Applied. Thanks!