PR: Several improvements to the IPython console

[ccordoba12]

Fixes #5944
Fixes #5759
Fixes #5360

This PR seeks to fix several issues with our IPython consoles, discovered after we removed the old Python console. In particular, we want to

• Improve kernel startup time
  • Move all imports in spyder_kernel.py to the methods that use them.
  • Stop using CONF in start_kernel.py
  • Use a local, simpler version of is_module_installed in start_kernel.py
  • Don't load Matplotlib in sitecustomize.py
• Use a default configuration for the inline backend.
• Show elapsed time.
• Show button to reset kernel.
• Check IPython version when trying to set use_jedi option.
• Test elapsed time with external kernels.
• Close Matplotlib windows when resetting namespace.
• Add Remove all variables entry to the Options menu
• Test what happens on dedicated consoles.

[pep8speaks]

Hello @ccordoba12! Thanks for updating the PR.

• In the file spyder/plugins/tests/test_ipythonconsole.py, following are the PEP8 issues :

Line 105:80: E501 line too long (80 > 79 characters)

• In the file spyder/utils/ipython/kernelspec.py, following are the PEP8 issues :

Line 103:80: E501 line too long (80 > 79 characters)

• In the file spyder/utils/ipython/spyder_kernel.py, following are the PEP8 issues :

Line 289:9: E722 do not use bare except'

• In the file spyder/utils/ipython/start_kernel.py, following are the PEP8 issues :

Line 28:5: E722 do not use bare except'

• In the file spyder/widgets/ipythonconsole/client.py, following are the PEP8 issues :

Line 321:42: E128 continuation line under-indented for visual indent
Line 562:37: E261 at least two spaces before inline comment

Comment last updated on December 10, 2017 at 23:23 Hours UTC