Adapt wiki to explain heat storages and changed heat pu…

[hannesdiedrich]

…mp interfaces

Reason for the proposed changes

Please describe what we want to achieve and why.

Proposed changes

INTEGRATION_TESTS_BRANCH=master
GSY_FRAMEWORK_BRANCH=master
SCM_ENGINE_BRANCH=master

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.08%. Comparing base (ea6875c) to head (fd867ca).
⚠️ Report is 10 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1924   +/-   ##
=======================================
  Coverage   73.08%   73.08%           
=======================================
  Files         156      156           
  Lines       15124    15124           
  Branches     1934     1934           
=======================================
  Hits        11053    11053           
  Misses       3554     3554           
  Partials      517      517           

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