EnhancedTextProgressBar not coherent with docstring of BaseProgressBar

[NathalyaaHikari]

Bug Description

When initializing an EnhancedTextProgressBar object the __init__ method is calling the start method of it's super class instead of it's own. When then using update (without calling start manually again) there will be an AttributeError because width is not getting initialized by __init__

Code to Reproduce the Bug

from qutip.ui.progressbar import *

n = 10
a = EnhancedTextProgressBar(n)
# a.start(n)
for i in range(n):
    a.update(i)
a.finished()

Code Output

Traceback (most recent call last):
  File "C:\Users\Name\Desktop\qutip_bug.py", line 6, in <module>
    a.update(i)
  File "C:\Users\Name\AppData\Local\Programs\Python\Python311\Lib\site-packages\qutip\ui\progressbar.py", line 96, in update
    all_full = self.width - 2
               ^^^^^^^^^^
AttributeError: 'EnhancedTextProgressBar' object has no attribute 'width'

Expected Behaviour

Proper initialization of the width attribute by EnhancedTextProgressBar.__init__

Your Environment

QuTiP Version:      4.7.1
Numpy Version:      1.24.2
Scipy Version:      1.10.1
Cython Version:     0.29.33
Matplotlib Version: 3.7.1
Python Version:     3.11.0
Number of CPUs:     8
BLAS Info:          OPENBLAS
OPENMP Installed:   False
INTEL MKL Ext:      False
Platform Info:      Windows (AMD64)

Additional Context

Currently in master the __init__ for both TextProgressBar and EnhancedTextProgressBar have been commented out and made to just pass. See

qutip/qutip/ui/progressbar.py

Line 66 in af49884

def __init__(self, iterations=0, chunk_size=10):

and

qutip/qutip/ui/progressbar.py

Line 94 in af49884

def __init__(self, iterations=0, chunk_size=10):

I would suggest making them both call their own start method to omit an additional call of start by the user right after initialization. This would also make both classes be in line with the usage suggested by the docstring of BaseProgressBar. Otherwise I would suggest to include the call to start in said docstring.

As I'm pretty new to github and git in general I would like to try and create a PR myself once you give me approval for the suggested change here.

[Ericgig]

Fixed in v5