Issue #359 tofu-custom allow customization of script parameters

[Didou09]

Main changes:

• User-customizable default parameters of tofuplot and tofucalc have been moved to a dedicated module tofu/scripts/_def.py
• tofu-custom now copies this module into the local .tofu/ directory so the user can edit these parameters

Issues:

Fixes, in devel, issue #359

[codecov-io]

Codecov Report

Merging #360 into devel will decrease coverage by 0.06%.
The diff coverage is 1.72%.

@@            Coverage Diff            @@
##           devel     #360      +/-   ##
=========================================
- Coverage   39.3%   39.24%   -0.07%     
=========================================
  Files         84       85       +1     
  Lines      24587    24625      +38     
=========================================
  Hits        9663     9663              
- Misses     14924    14962      +38

Impacted Files	Coverage Δ
tofu/scripts/tofucustom.py	0% <0%> (ø)	⬆️
tofu/scripts/_def.py	0% <0%> (ø)
tofu/scripts/tofuplot.py	0% <0%> (ø)	⬆️
tofu/scripts/tofucalc.py	0% <0%> (ø)	⬆️
tofu/version.py	100% <100%> (ø)	⬆️

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