Fixed help sentences for hold arguments.
Added arguments for the figure function.
Added logic to run the figure function as a post-execute hook.
Added a function to sort the _post_execute IPython dictionary to call the figure function alfter the show one.
Fixed --figure deactivation bug and added some docstrings.
One line messages
Added a new way to arrange the dict to execute the function in the correct order.
Got rid of the pre hook also for the hold function. All working with post_execute functions.