[mccabe] Moved to ::shadow

Closes #816.
[flake8] Moved to ::shadow

Closes #814.
[funcparserlib] Moved to ::shadow

Closes #815.  This forces keyword drops for a lot of packages, I apologise if
you're stuck on portage and this causes you grief.
[pgmagick] Moved to ::shadow

Closes #817.
[socksipy] Moved to ::shadow

Closes #818.
Manual update of removal texts
Merge branch 'feat/removals'

* feat/removals:
  Manual update of removal texts
  [socksipy] Moved to ::shadow
  [pgmagick] Moved to ::shadow
  [funcparserlib] Moved to ::shadow
  [flake8] Moved to ::shadow
  [mccabe] Moved to ::shadow