Description of proposed changes

Simplify the input arguments for object initiation for tsview, plot_transection and plot_coherence_matrix:

• for each *Viewer object init(): replace cmd/iargs with inps, as the later covers both, and simpler.

• for each *Viewer configure(): rename to open() for simplicity

Reminders

• Fix tsview notebook example error missing required inps in v1.5.1 #977
• Pass Pre-commit check (green)
• Pass Codacy code review (green)
• Pass Circle CI test (green)
• Make sure that your code follows our style. Use the other functions/files as a basis.
• If modifying functionality, describe changes to function behavior and arguments in a comment below the function declaration.