Use local version of SHTML module

Had to add some changes to run under windows/webmerge.
Turn these changes into a module that inherits from SHTML.
Add special DOM root node feature to SSI include

Only include subparts of html pages into the source file.
Very useful to develop prototypes and component galleries.
The selector for the root uses the jQuery syntax (pQuery).
Adds webserver example (with emphasis on SSI includes)