Create Timetables for Finance

Create a timetable with financial data

Functions

`timetable`	Timetable array with time-stamped rows and variables of different types
`fts2timetable`	Convert financial time series objects (`fints`) to timetable object
`table2timetable`	Convert table to timetable
`array2timetable`	Convert homogeneous array to timetable

Use Timetables in Finance
Use timetables to visualize and calculate weekly statistics from simulated daily stock data.
Convert Financial Time Series Objects fints to Timetables
Convert financial time series objects to timetables