diff --git a/.appveyor.yml b/.appveyor.yml
index 706375f2..157bfc9e 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -155,9 +155,7 @@ install:
   # Missing system software
   - sh: "[ -n \"$INSTALL_SYSPKGS\" ] && ( [ \"x${APPVEYOR_BUILD_WORKER_IMAGE}\" = \"xmacOS\" ] && brew install -q ${INSTALL_SYSPKGS} || { sudo apt-get update -y && sudo apt-get install --no-install-recommends -y ${INSTALL_SYSPKGS}; } ) || true"
   # If a particular Python version is requested, use env setup (using the
-  # appveyor provided environments/installation). Note, these are broken
-  # on the ubuntu images
-  # https://help.appveyor.com/discussions/problems/28217-appveyor-ubunu-image-with-python3-lzma-module
+  # appveyor provided environments/installation).
   # Otherwise create a venv using the default Python 3, to enable uniform
   # use of python/pip executables below
   - sh: "[ \"x$PY\" != x ] && . ${HOME}/venv${PY}/bin/activate || python3 -m venv ${HOME}/dlvenv && . ${HOME}/dlvenv/bin/activate; ln -s \"$VIRTUAL_ENV\" \"${HOME}/VENV\""
diff --git a/.codespellrc b/.codespellrc
new file mode 100644
index 00000000..4cf7f14b
--- /dev/null
+++ b/.codespellrc
@@ -0,0 +1,4 @@
+[codespell]
+skip = .venv,venvs,.git,build,*.egg-info,*.lock,.asv,.mypy_cache,.tox,fixtures,_version.py,*.pem
+# ignore-words-list = 
+# exclude-file = 
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index aa807cd2..7d3e0391 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -1,3 +1,4 @@
+# This action keeps the versions of all github actions up-to-date
 version: 2
 updates:
   - package-ecosystem: github-actions
diff --git a/.gitignore b/.gitignore
index 38321b50..9c707e32 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,5 @@
 docs/build
 docs/source/generated
 build  # manpage
+.idea/
+venvs/
diff --git a/readthedocs.yml b/.readthedocs.yaml
similarity index 100%
rename from readthedocs.yml
rename to .readthedocs.yaml
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 83e12455..c99208d8 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -69,6 +69,7 @@
     'sphinx.ext.inheritance_diagram',
     'sphinx.ext.viewcode',
     'sphinx.ext.napoleon',
+    'sphinx_copybutton',
 ]
 
 # for the module reference
diff --git a/setup.cfg b/setup.cfg
index 6296a06f..0616ed9e 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -30,6 +30,7 @@ devel =
     coverage
     sphinx
     sphinx-rtd-theme
+    sphinx-copybutton
 
 [options.packages.find]
 # do not ship the build helpers