Apply a slanted text to the template of histogram
Spread a chart area
Tidy up unit tests.

Sort test modules by the order of test targets.
Indent strings properly.
Add placeholders.
Add tests for kclv.Formatter#dialogue()
Add tests for kclv.Array#maximum() and #minimum()
Add tests for kclv.Date#toPeriod()

In this context, correct the return value when 'Yearly' parameter was specified.
Add basic tests for properties of kclv.Game.Ships object
Add basic tests for kclv.Agent.* objects with ships log files
Add tests for kclv.Tokenizer.* objects
Add tests for kclv.Relation.Base object
Add tests for kclv.Relation.Materials object
Add tests for kclv.Relation.Ships object
Add tests for kclv.Table.Materials.Candlestick object

In this context, correct a bug in kclv.Table.Candlestick#buildRows() that the last row may not be placed on a table; and change the return value of kclv.Table.Base#count().
Add tests for kclv.Table.Materials.Line object