Allow profile selection ipython magic %aiida

[zhubonan]

Fixes #4095

A small change in the ipython %aiida magic to allow selection of the profile. The name of the profile is echoed back so the user knows what they are using.

[codecov]

Codecov Report

Merging #4071 into develop will increase coverage by 0.20%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop    #4071      +/-   ##
===========================================
+ Coverage    78.57%   78.76%   +0.20%     
===========================================
  Files          461      463       +2     
  Lines        34095    34402     +307     
===========================================
+ Hits         26787    27094     +307     
  Misses        7308     7308              

Flag	Coverage Δ
#django	70.67% <0.00%> (+0.08%)	⬆️
#sqlalchemy	71.55% <0.00%> (+0.11%)	⬆️

Impacted Files	Coverage Δ
aiida/tools/ipython/ipython_magics.py	0.00% <0.00%> (ø)
aiida/tools/importexport/dbexport/__init__.py	97.72% <0.00%> (-1.39%)	⬇️
aiida/cmdline/commands/cmd_import.py	77.50% <0.00%> (-0.08%)	⬇️
aiida/tools/importexport/common/config.py	100.00% <0.00%> (ø)
aiida/tools/importexport/common/exceptions.py	100.00% <0.00%> (ø)
...iida/tools/importexport/dbimport/backends/utils.py
aiida/tools/importexport/common/progress_bar.py	83.34% <0.00%> (ø)
aiida/backends/utils.py	95.00% <0.00%> (ø)
aiida/tools/importexport/dbimport/utils.py	82.90% <0.00%> (ø)
aiida/common/folders.py	82.06% <0.00%> (+0.52%)	⬆️
... and 9 more

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[CasperWA]

This is cool! Thanks @zhubonan.

I have a small comment/question though, see below.

[ltalirz]

thanks @zhubonan - I think this is a great and simple addition

just two minor nitpicks.

no further need for review from my side after this; can then be merged

[zhubonan]

@ltalirz I have just tweaked the documentation accordingly. Thanks.

[ltalirz]

thanks @zhubonan !