Removed unused PAGE_ATTR vars
Added scm information
Made vault filters more specific
Moved error information retrieval to the errormessage.jsp instead of in the default.jsp and passing it via pageContext to the errormessage.jsp.

errormessage.jsp is now included via cq:include script, which allows
the errorpagehandlerservice to be referenced again without maven jspc
issues w var duplication. Removed the hard "embed" depdency which is
good.
Moved error message information from default.jsp to errormessage.jsp
Scoped dom element selection even further