Fix relay_command_to_string(); solve 12700.

Two bugs here:
  1) We didn't add EXTEND2/EXTENDED2 to relay_command_to_string().

  2) relay_command_to_string() didn't log the value of unrecognized
     commands.

Both fixed here.
Add more escaped() calls in directory.c

Patch from teor to fix 13071.
Clean up the MVSC nmake files so they work again.

Fixes bug 13081; bugfix on 0.2.5.1-alpha. Patch from "NewEraCracker."
Merge remote-tracking branch 'public/bug12700_024' into maint-0.2.5
Merge remote-tracking branch 'origin/maint-0.2.5' into release-0.2.5
Add new changes entries to 0.2.5.7-rc changelog