Initial commit.

TODO

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+* chklinks does not support authentication yet.  W3C-LinkChecker
+  have support on this.  As a workaround, You can use the syntax
+  http://user:pass@some.where.com/some/path for Basic Authentication,
+  but this does not work on Digest Authentication.  This practice is
+  not encouraged, too.  Your password would be visable to anyone on
+  this system using ps, including hidden intruders.  Also what you
+  type in your shell will be saved to your shell history file.
+
+* mailto: URLs should be supported by checking the validity of its
+  DNS/MX record.
+
+* Local file checking has only been tested on Unix and MS-Windows.
+  More platforms should be tested, especially VMS and Mac.
+
+* chklinks does not obey Crawl-delay: in robots.txt yet.  This is a
+  problem in WWW::RobotRules, but not chklinks itself.