[medusa/f17] (4 commits) ...upgrade to version 2.1

[rebus]

Summary of changes:

  6aefa6b... Rebuild against PCRE 8.30 (*)
  be6ab93... Fix compilation with newer GCC (*)
  2f61ed9... Upgrade to version 2.1 (*)
  528e8fb... upgrade to version 2.1 (*)

(*) This commit already existed in another branch; no separate mail sent