maint-bin: Added code to update top-posts from markdown pages. :)

Because those top-posts should be wiki pages.  And now they are.
maint-bin: forum-patchlog can produce output in markdown
remove siren and related research
added garrison reaction for siren

- restores the accidentally removed the siren reaction that the garrison
uses in the last commit
Merge pull request #120 from splintermind/gold

Tidyup: removes obsolete siren reactions.
Merge branch 'gold' into beta

* gold:
  maint-bin: forum-patchlog can produce output in markdown
  maint-bin: Added code to update top-posts from markdown pages. :)

Conflicts:
	maint-bin/maint-settings.ini.example
maint-bin: Add our changelog automatically to SWP top-posts
Diseases are now off by default.
Merge branch 'gold' into beta

* gold:
  Diseases are now off by default.
  maint-bin: Add our changelog automatically to SWP top-posts
  added garrison reaction for siren
  remove siren and related research