Also make model#sn shortcuts.
notes
Merge branch 'master' into makeShortcutsModelSN
improve speed of search and other users of _infotree
Merge branch 'master' of github.com:exosite/exoline
add issue link to history
Merge branch 'master' into makeShortcutsModelSN
update history.
Merge pull request #66 from tadpol/makeShortcutsModelSN

Add model#sn support to makeShortcuts