[keyboard] fix differential drive rotation

Thanks to Alexandre Izaute for reporting this on morse-users@laas.fr
[doc] Prepare indexcontent for 1.1
[doc] Move release note for 1.0 in its own file
[doc] Upgrade several reference from 1.0 to 1.1
[bindings] Increment version number of pymorse
[doc] link `What's new` to GitHub issues

sed -i.bak -e "s@#\([1-9][0-9]*\)@\`#\1<https://github.com/morse-simulator/morse/issues/\1>\`_@g" what_new.rst
[doc] Mention contribution of Mehmet Murat Sevim
[doc] Another mention of 1.1 in install
[cmake] Prepare for 1.1