Delft 3D Timestep to Seconds Function

[browniea]

This PR outputs the time based on the time step in function convert_time, d3d. get_layer_data and d3d.get_all_data_points. A function to get all timestamps 'get_all_timestamps' will return an array of all the timestamps for a data set.

Additions: -get_all_timestamps : inputs netcdf4 dataframe and return as all the time stamps for that data set -convert_time : converts a time_index to a time_stamp in seconds or vice versa

Changes in 'get_layer_data`

• 'cords_to_layers' dictionary
• depth output z :z=[bottom_depth*Layer_percentages[layer_index]]-water_level
• updated interpolation for bottom_depth and water_level in wdim coordinate system

Changes in 'get_all_data_points`

• 'cords_to_layers' dictionary
• depth z is pulled from 'get_layer_data` and takes into account water level

[browniea]

Changing the d3d.turbulent_intensity function to output TI in a percentage rather than a fraction

TI_data['turbulent_intensity']= np.sqrt(2/3*TI_data['turkin1'])/u_mag * 100