Add source plugin to core/pom.xml, so that clients know that optiq-core-javadoc.jar is available.
Add source plugin to core/pom.xml, so that clients know that optiq-core-javadoc.jar is available.

joshelser/incubator-calcite,dindin5258/calcite,jcamachor/calcite,jcamachor/calcite,googleinterns/calcite,jcamachor/calcite,amoghmargoor/incubator-calcite,looker-open-source/calcite,YrAuYong/incubator-calcite,mehant/incubator-calcite,julianhyde/calcite,apache/calcite,mprudhom/incubator-optiq,apache/calcite-avatica,datametica/calcite,julianhyde/calcite,apache/calcite,datametica/calcite,googleinterns/calcite,apache/calcite-avatica,julianhyde/optiq,mehant/incubator-calcite,apache/calcite-avatica,wanglan/calcite,b-slim/calcite,googleinterns/calcite,amoghmargoor/incubator-calcite,julianhyde/calcite,jcamachor/calcite,hsuanyi/incubator-calcite,vlsi/calcite,googleinterns/calcite,sreev/incubator-calcite,hsuanyi/incubator-calcite,looker-open-source/calcite-avatica,adeshr/incubator-calcite,datametica/calcite,vlsi/incubator-calcite,adeshr/incubator-calcite,hsuanyi/optiq,amoghmargoor/incubator-calcite,sudheeshkatkam/incubator-calcite,apache/calcite,joshelser/calcite-avatica,hsuanyi/incubator-calcite,amansinha100/incubator-calcite,yeongwei/incubator-calcite,vlsi/calcite,hsuanyi/optiq,jinfengni/incubator-optiq,YrAuYong/incubator-calcite,sreev/incubator-calcite,dindin5258/calcite,looker-open-source/calcite-avatica,minji-kim/calcite,joshelser/incubator-calcite,looker-open-source/calcite,glimpseio/incubator-calcite,julianhyde/calcite,minji-kim/calcite,hsuanyi/incubator-calcite,minji-kim/calcite,joshelser/incubator-calcite,adeshr/incubator-calcite,arina-ielchiieva/calcite,b-slim/calcite,joshelser/calcite-avatica,arina-ielchiieva/calcite,mapr/incubator-calcite,xhoong/incubator-calcite,dindin5258/calcite,glimpseio/incubator-calcite,wanglan/calcite,apache/calcite,googleinterns/calcite,jinfengni/incubator-optiq,vlsi/calcite,julianhyde/calcite,arina-ielchiieva/calcite,yeongwei/incubator-calcite,apache/calcite-avatica,julianhyde/calcite,yeongwei/incubator-calcite,datametica/calcite,mprudhom/incubator-optiq,amoghmargoor/incubator-calcite,yeongwei/incubator-calcite,looker-open-source/calcite,minji-kim/calcite,glimpseio/incubator-calcite,joshelser/calcite-avatica,arina-ielchiieva/calcite,b-slim/calcite,amansinha100/incubator-calcite,joshelser/incubator-calcite,sudheeshkatkam/incubator-calcite,looker-open-source/calcite-avatica,dindin5258/calcite,jinfengni/optiq,mapr/incubator-calcite,glimpseio/incubator-calcite,b-slim/calcite,xhoong/incubator-calcite,sreev/incubator-calcite,sudheeshkatkam/incubator-calcite,xhoong/incubator-calcite,YrAuYong/incubator-calcite,looker-open-source/calcite,apache/calcite-avatica,apache/calcite,arina-ielchiieva/calcite,googleinterns/calcite,jcamachor/calcite,datametica/calcite,YrAuYong/incubator-calcite,vlsi/calcite,jinfengni/optiq,datametica/calcite,dindin5258/calcite,apache/calcite,devth/calcite,wanglan/calcite,looker-open-source/calcite,sreev/incubator-calcite,dindin5258/calcite,wanglan/calcite,vlsi/calcite,minji-kim/calcite,vlsi/incubator-calcite,b-slim/calcite,adeshr/incubator-calcite,looker-open-source/calcite-avatica,devth/calcite,looker-open-source/calcite-avatica,sudheeshkatkam/incubator-calcite,xhoong/incubator-calcite,vlsi/calcite,jcamachor/calcite,looker-open-source/calcite,julianhyde/optiq