Masterwork 4f release

Since this is based upon the `MWDF_4f_release_candidate_r4` tagged commit,
I've imported the history of that up until this point on the upstream
branch.

This commit brings things to be inline exactly as they are with Meph's
released file (which doesn't have the maint tools or source code).
Merge branch 'upstream' (Masterwork 4f release)

This merge brings in all our upstream (really unified) changes,
but preserves our source-code, README, and maint tools.

* upstream:
  Masterwork 4f release
  Add \ALLOW_NONWORKER_TARGETS to all \ALLOW_MULTIPLE_TARGETS syndromes
  Fix missing 'end' marker in spawn.lua.
  Upgrade to stonesense for DFHack r4
  thistleknot: Increase plague immunity
  Nerfed diseases v6 by thistleknot.
  Remove now redundant WORKER_ONLY tag from reactions.
  Update itemsyndrome.lua
  Add SYN_CLASS:\AUTO_SYNDROME to all SYN_CLASS:\COMMANDs
  Incude and enable all of Falconne's plugins for DFHack r4
  DFHack (R4): Eanble mousequery and zone.
  Enable DFHack search plug-in.
  Added random command to dfhack
  Removed old r3 plug-ins from the DFHack directory. GH #2
  Update itemsyndrome.lua
  Updated DFHack itself to version 0.34.11-r4 and removed any error-causing plugins
  Updated raws for new itemsyndrome
  Update spawn.lua for DFHack 0.34.11-r4
  Updated spawn.lua for DFHack 0.34.11 r4

Conflicts:
	README.md
maint-bin: retire nerfed_diseases branch
Merge branch 'master' into unified

* master:
  maint-bin: retire nerfed_diseases branch
  Masterwork 4f release