Visuals

I have adapted the patch from issue 724 by alexghir9 following the
suggestion from Edvin
Visuals updated

Made some changes following suggestions from AlbertFree
Thanks
Comment updated

As per suggestion from Albet
Visuals

allows #visuals_available  gbv.HoldVisual gbv.HoldVisualPeepCount to be
used by the game to determine if and when a visual disease can appear
in-game
Tooltips for decrease / increase buttons in the research policy dialog
Billy Savile (VIP)

This replaces one VIP and is only relevant to the English Language,
unless he also appears in other languages!
added indent and removed spare line
Refactored the code and added some comments
Issue #50

I was not able to replicate the same error after this small change
Update french.lua

Fix typography rules.
Update CMakeLists.txt for moved LICENSE.txt in the parent directory

Reported on https://code.google.com/p/corsix-th/issues/detail?id=1704&start=100
Better to provide a patch here. :-)
Bug still available.
Update french.lua

fix missing unit for money and add # for IRC channel
Reformatted the comment to conform the wiki guideline
Give it an .txt extension
Also give the README file an .txt extension
Added the .txt extensions to README and LICENSE here too and make sure that the socket and mime folder are also deleted after uninstall
Rename CONTRIBUTING to CONTRIBUTING.txt
Possible fix for issue #64

Ensure that neither of the messages from the advisor for numbers cured
or killed are displayed for the first of either as there is already
special messages for both these.
Fix: someone used tabs instead of spaces
Update the hotkey Dutch translation