Delft 3D Timestep to Seconds Function (#168)

* fixing file history

* fixing file history

* fixing file history

* made revisions from ssolson review

* changed time_stamp to timestamp

* updated varible names

* updated variable names

* fixed syntax line 63

* umdated variable name

* fixed typos in doc strings

* ssolson review 5-26-2022

* deleted excessive code in get_all_data

* chaged TI to a % from a fraction

* adjusted TI test to be a %

* fixed doc string for TI function

* Docstring adjustments

* updated doc strings

* Make convert_time a hidden func, make 2 functions to access it

* Minor changes to get_lay_data docstring and formatting

* small changes

* remove print from create_points

* example notebook clean up

* fixed merge confilics

* updated after merge

* final developmet barnach merge updates

* deleated space

* Delete test_river.py

* added coverage to test

* updated min and max plot labels

Co-authored-by: Browning <[email protected]>
Co-authored-by: ssolson <[email protected]>