Moved user-defined ElementMapping initialization from Driver to FOUserAgent.
Moved only "string" method, the version we use internally--probably sufficient
for others' work as well. (Note: an additional unused FOUserAgent object will
be created in driver during command-line use--cp. its no-param constructor vs.
setUserAgent() call in apps.Fop; this will need to be ironed out at some time.)
git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@197794
13f79535-47bb-0310-9956-
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