Convert Jupyter notebooks for T005–T008 to plain Python

[khaeru]

Supersedes #22; will close #49.

• Remove the remaining Jupyter/IPython notebooks.
• Remove code for running and testing these notebooks.
• [x] Complete the code per the descriptions:
  • [x] T005
  • [x] T006
  • [x] T007
  • [x] T008
• [x] Add consistency checks after .historical.process().
• [x] Check and fix contents of transportenergy/metadata; the files named e.g. input/T005_input.csv (used by the Jupyter notebooks) seem to be mismatched with the ones named e.g. input/T005.csv (expected by the Python code).
• [x] Pass tests.
• [x] Update documentation.

[khaeru]

The notebook for T005 contained the following text:

There are five IPCC descriptions and this is how each one is mapped to our schema:

1. For countries: IPCC --> Mode Railways --> Rail Road Transportation --> Road Civil Aviation --> Air Other Transportation --> Other Water-borne Navigation --> Shipping

2. For Int. Aviation country: IPCC --> Mode Civil Aviation --> Domestic Aviation

3. For Int. Shipping country: IPCC --> Mode Water-Borne Navigation --> Domestic Shipping

This seems wrong. "International Aviation" is not "Domestic Aviation"; these things are the opposite of one another. The mode in this case should be "Air".

The PR corrects this error.

[codecov[bot]]

Codecov Report

Merging #71 (3e9134f) into master (ac4802d) will increase coverage by 15.68%. The diff coverage is 93.80%.

@@             Coverage Diff             @@
##           master      #71       +/-   ##
===========================================
+ Coverage   57.23%   72.91%   +15.68%     
===========================================
  Files          49       32       -17     
  Lines        1887     1370      -517     
===========================================
- Hits         1080      999       -81     
+ Misses        807      371      -436     

Impacted Files	Coverage Δ
item/structure/__init__.py	100.00% <ø> (ø)
item/structure/sdmx.py	92.64% <ø> (ø)
item/historical/T001.py	79.31% <66.66%> (ø)
item/historical/__init__.py	89.40% <91.35%> (-5.65%)	:arrow_down:
item/historical/T009.py	92.85% <92.85%> (ø)
item/historical/T000.py	100.00% <100.00%> (ø)
item/historical/T002.py	100.00% <100.00%> (ø)
item/historical/T003.py	100.00% <100.00%> (ø)
item/historical/T004.py	100.00% <100.00%> (ø)
item/historical/T005.py	100.00% <100.00%> (ø)
... and 33 more

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