Excel limits sheet names to 31 characters (if project name is longer, causes error)

Excels library automatically trims to 31 characters
However, next time try to get sheet, says no worksheet with the name, since getSheet method doesn't trim the name

For any projects over 31 characters, add an entry to the project to sheet name map for the project name to the shortened sheet name

Also add this as a note to the javadoc