897 new add initialization method from flows for lct model 1

[lenaploetzke]

Changes and Information

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

• added functionality to compute an initial vector for the LCT-SECIR model based on flows

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

-/-

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Closes #897.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.27%. Comparing base (d439941) to head (0181407).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1005 +/- ## ========================================== + Coverage 96.24% 96.27% +0.03% ========================================== Files 127 128 +1 Lines 10886 10992 +106 ========================================== + Hits 10477 10583 +106 Misses 409 409 ```

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[lenaploetzke]

I was thinking that initializer_subcompartments might be a more suitable name than initializer_flows as you are calculating initial values of the subcompartments for given flows.

I do not think that initializer_subcompartments is a better name, because e.g. the realistic initialization also initializes subcompartments. The naming should include that we are using flows for initialization.

[lenaploetzke]

The LCT model has been updated in the meantime, so small changes had to be made here