Issue 944 autodisc

[valentinsulzer]

Description

Automatically discretize a 0D model if it is passed to a solver without having been discretized

Fixes #944

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist:

• No style issues: $ flake8
• All tests pass: $ python run-tests.py --unit
• The documentation builds: $ cd docs and then $ make clean; make html

You can run all three at once, using $ python run-tests.py --quick.

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

Merging #947 into develop will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #947      +/-   ##
===========================================
+ Coverage    98.09%   98.10%   +0.01%     
===========================================
  Files          222      223       +1     
  Lines        11176    11266      +90     
===========================================
+ Hits         10963    11053      +90     
  Misses         213      213              

Impacted Files	Coverage Δ
pybamm/discretisations/discretisation.py	99.76% <100.00%> (+<0.01%)	⬆️
pybamm/expression_tree/exceptions.py	100.00% <100.00%> (ø)
pybamm/models/base_model.py	98.58% <100.00%> (+<0.01%)	⬆️
pybamm/solvers/base_solver.py	99.72% <100.00%> (+<0.01%)	⬆️
...m/models/full_battery_models/lead_acid/__init__.py	100.00% <0.00%> (ø)
...models/full_battery_models/lead_acid/basic_full.py	100.00% <0.00%> (ø)

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[rtimms]

thanks