D-Net

added xml indentation helpers

added dumb xslt extension function, used to pick the first non empty value

saxon does not support varargs, changed xslt join function :(

added xslt join function

deprecated custom use of Caches, we should stick instead on the caching mechanism provided by spring

copies the ns prefix as well

copies also the namespaces of the splitting element

better logging

Updated the URIresolver class
This class contains the login enabling imports of peer external resources for the current xslt (<xsl:import>)
Its method resolve() first looks for the resource within the file system; if this fails, it looks in the classpath.