changes to 6.1
changes to 6.2
changes to 6.3
changes to 6.4
changes to 6.5
changes to 6.6
changes to 6.7
changes to 6.8
minor changes to 6.1 to 6.8; changes to 6.9, 6.10, 6.11, 6.12; start 6.13
Merge branch 'master' of https://github.com/rpruim/Lock5withR