High dpi suport on Linux
Created originally on Bitbucket by Neutrino_Sunset (Neutrino Sunset)
On Linux all TortoiseHg icons are tiny to the point of unusability on the kind of screen resolution that are normal these days.
Tested on:
thg version TortoiseHg Dialogs (version 3.7.3+12-c32f1d975877), Mercurial (version 3.8-rc)
Linux Mint 17.3 MacBook Pro Retina, late 2013 v11.3 Screen 2880 x 1800