[tests] Fix inclusions and omissions in .coveragerc

Unfortunnately, in pre-6.6, the following issues affect the results:

- nedbat/coveragepy#1407
- nedbat/coveragepy#1486

.coveragerc

@@ -1,16 +1,14 @@
 [run]
+source =
+    pycroft
+    ldap_sync
+    hades_logs
+    web
 omit =
-    */lib/python2.6/*
-    */pyshared/*
-    tests/*
-    */alembic/versions/*
-    web/*
+    tests
+    **/alembic/**
+    .pycharm_helpers
 
 [report]
 omit =
-    */lib/python2.6/*
-    */pyshared/*
-    tests/*
-    */alembic/versions/*
-    web/*
-
+    **/alembic/**

requirements.dev.txt

@@ -4,6 +4,8 @@ pydot~=1.4.1
 pytest~=7.0.0
 pytest-timeout~=2.1.0
 pytest-cov~=3.0.0
+# required for pycharm „run with coverage“ reporting
+coverage~=6.5.0
 git+https://github.com/lukasjuhrich/sqlalchemy_schemadisplay.git@master#egg=sqlalchemy-schemadisplay
 sphinx~=5.1.1
 sphinx-autobuild~=2021.3.14