Issue 825 tplus

[valentinsulzer]

Description

Make t_plus and (1 + dlnf/dlnc) functions of c_e

Fixes #825

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 #921 into develop will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop     #921   +/-   ##
========================================
  Coverage    98.00%   98.00%           
========================================
  Files          208      208           
  Lines        10929    10931    +2     
========================================
+ Hits         10711    10713    +2     
  Misses         218      218           

Impacted Files	Coverage Δ
...l_battery_models/lead_acid/base_lead_acid_model.py	100.00% <ø> (ø)
...ttery_models/lithium_ion/base_lithium_ion_model.py	100.00% <ø> (ø)
...odels/full_battery_models/lithium_ion/basic_dfn.py	100.00% <ø> (ø)
.../diffusion/first_order_stefan_maxwell_diffusion.py	100.00% <ø> (ø)
...well/diffusion/leading_stefan_maxwell_diffusion.py	100.00% <ø> (ø)
...y/base_higher_order_stefan_maxwell_conductivity.py	98.07% <100.00%> (-0.14%)	⬇️
...ll/diffusion/composite_stefan_maxwell_diffusion.py	97.22% <100.00%> (+0.25%)	⬆️
...maxwell/diffusion/full_stefan_maxwell_diffusion.py	100.00% <100.00%> (ø)
pybamm/parameters/standard_parameters_lead_acid.py	99.25% <100.00%> (-0.01%)	⬇️
...bamm/parameters/standard_parameters_lithium_ion.py	100.00% <100.00%> (ø)

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[Scottmar93]

Nice one, looks good