The entry class represents a column in the statistics file.
Its components are a title, a format and an additional object. It's what gets written to the statistics file in a column.
- title: the title of the column
- format: a wisely chosen format string (see below)
- something: either something that can be formattable, a string, a number etc. This is a static entry. In that case all remaining arguments are discarded and get_value returns the formatted string : format % something. If something is a function, this is a dynamic entry, and the format string is used on the result of the function call something(*args,**kwargs).
