893 add initialization method with real data for lct model

[lenaploetzke]

Changes and Information

Please briefly list the changes (main added features, changed items, or corrected bugs) made:

• added ConfirmedCasesNoAgeEntry to epi_data
• added method to use real data for an initialization of the lct model - method is comparable to the initialization of the ODE model, see also the master thesis

If need be, add additional information and what the reviewer should look out for in particular:

• Do you think an example should be added here? I would possibly suggest a shared example with the second initialization method (see Add initialization method from flows for LCT model #897).

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Closes #893

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.29%. Comparing base (f005eaf) to head (7b1b461).

Additional details and impacted files

@@            Coverage Diff             @@
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+ Coverage   96.21%   96.29%   +0.07%     
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  Files         122      123       +1     
  Lines        9638     9844     +206     
==========================================
+ Hits         9273     9479     +206     
  Misses        365      365              

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[annawendler]

Nice work! I haven't looked at the actual computation and the tests so far and will do this soon.

[lenaploetzke]

I have to restructure the file parameters_io.h because of the extensive changes of the LCT model in the main branch. The functionality will remain the same.

[annawendler]

Finished the review.

[annawendler]

Looks good!
I wouldn't add an example right now but discuss this in #897 as suggested by you.