Import Upstream version 2.7.18

Tools/webchecker/README

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+Webchecker
+----------
+
+This is a simple web tree checker, useful to find bad links in a web
+tree.  It currently checks links pointing within the same subweb for
+validity.  The main program is "webchecker.py".  See its doc string
+(or invoke it with the option "-?") for more defails.
+
+History:
+
+- Jan 1997.  First release.  The module robotparser.py was written by
+Skip Montanaro; the rest is original work by Guido van Rossum.
+
+- May 1999.  Sam Bayer contributed a new version, wcnew.py, which
+supports checking internal links (#spam fragments in URLs) and some
+other options.
+
+- Nov 1999.  Sam Bayer contributed patches to reintegrate wcnew.py
+into webchecker.py, and corresponding mods to wcgui.py and
+websucker.py.
+
+- Mar 2004.  Chris Herborth contributed a patch to let webchecker.py
+handle XHTML's 'id' attribute.