Fix for list_workbaskets to accept multiple workbasket ids.

[stuaxo]

Split out dump_transactions main method so it can be called from notebooks more conveniently.
Fix for list_workbaskets to accept multiple workbasket ids.
(Note: We should probably make all the commands that accept workbaskets accept comma separated lists of ids!)

Ensure to actually test, I noticed the list_workbaskets change and added but don't have time to double check, the dump_transactions change is basically just eyeballed as don't have time to double check before going, but I think this is probably a better way of using this from notebooks than the current way of grabbing the Command internals, so even if it doesn't work it may be worth making work.

[codecov-commenter]

Codecov Report

Merging #668 (f03bc89) into master (2aba9d3) will increase coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #668      +/-   ##
==========================================
+ Coverage   93.36%   93.44%   +0.07%     
==========================================
  Files         324      325       +1     
  Lines       20822    21124     +302     
  Branches     1658     1672      +14     
==========================================
+ Hits        19441    19739     +298     
+ Misses       1067     1063       -4     
- Partials      314      322       +8     

Impacted Files	Coverage Δ
workbaskets/session_store.py	85.18% <0.00%> (-11.12%)	⬇️
workbaskets/views/ui.py	72.68% <0.00%> (-6.38%)	⬇️
commodities/forms.py	72.00% <0.00%> (-5.28%)	⬇️
measures/business_rules.py	87.03% <0.00%> (-1.68%)	⬇️
workbaskets/urls.py	100.00% <0.00%> (ø)
common/tests/util.py	89.11% <0.00%> (ø)
common/tests/test_util.py	100.00% <0.00%> (ø)
common/tests/test_views.py	100.00% <0.00%> (ø)
importer/tests/conftest.py	100.00% <0.00%> (ø)
importer/tests/test_views.py	100.00% <0.00%> (ø)
... and 17 more

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