faster without open file handle

if dir contains a file.list , only process files inside it

fix missing header includes

Fix major bug introduced in r258 [61b6d7b3de61]: SetDone() was being called on the "Files" child since that wouldn't contain subdirectories, but now that the "Files" child is no longer supported, it shouldn't be called on the current node.

Adding rich preview meta tags

Adding images which had never been committed before due to .hgignore; adjusted .hgignore.

Optimized the JPG files

Minor adjustments after redirecting to windirstat.net from windirstat.info and after making everything available via https

Added SHA1 of the installer itself

Removed explicit naming of contributors from the individual files, everybody who is interested can glean that info from the version control system (for the rest see CONTRIBUTORS.md)

Updating copyright year, replacing Copyright for myself with WinDirStat team to signify contributions by others

Allegedly relative links work now ... let's see

Using stdafx.h everywhere

Updating README, let's see whether relative links work now

Removing TODO.txt. Create Issue #136 instead. Any new issues should go into the tracker anyway.