Removed left over SVN placeholders.
Made text files markdown compatible
Various modifications re recent changes to the project

* Changed system requirements
* Changed URLs
* Minor tweaks
Removed UHTMLHelp.pas from project.

This unit provided an interface to the hhctrl.ocx control and was needed when the Delphi VCL didn't support the control. The unit is now redundant because hhctrl.ocx support has been included in the VCL.