remove JavaAdvancedImaging (jai) as it seems not be needed anymore

I did local tests to generate our docs and with the new docbkx version it seems to work fine.
I removed all jai deps as the jai jars are NOT available on maven.central and the license
does not allow to redistribute the jars.


git-svn-id: https://svn.apache.org/repos/asf/openjpa/trunk@1735806 13f79535-47bb-0310-9956-ffa450edef68
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