working on configurable error pages.
elda-common (with no configs) now handles 404s with a 404.html
error page and stylesheet. Currently if a config is installed (the usual case) this doesn't work.
That's next on the list.
Handling 303 errors with no styling; also, added tagname for build.
Changes to Elda's error reporting. In general
Elda throws a limited variety of exceptions through RouterRestlet, expecting
them to me managed by the container within which it sits. Specifically we
design for Tomcat and have error-page declarations in the web.xml which map
these exceptions to some default text with no details (hence not leaking
details to a possible attacker).

Tomcat allows those default pages to be overridden by setting Context's
in the conf directories, allowing the error dsiaplyas to be styled as
appropriate to the application.
Tweak version tag.
Corrected closing tag for <html> in error pages.
Put inline stuyle back in 400-error-page.
Updated version tag.