Fixed compile error. Cast using (Integer) instead of (int)
Moved group-commands under /tchest group

* Also changed a bunch of messages. Including my own, older messages.
* Also changed a message in set-single
* Also changed a bunch of IF-statements from
args != null && args.length != 1 to args == null || args.length != 1

Planning to change name Singleton treasure to Shared treasure.
Fixed message "contents updated" after last commit
Renamed Singleton to Shared

Since this has nothing to do with the singleton design pattern