1.8.4

• oracle: new scripts ora gather/spa/idn
• oracle: new scripts show slowsegs
• oracle: new script sys xplan
• oracle: enhancements on ora stats/sta/actives
• oracle: downgrade lib ojdbc8.jar to 19.5 to support 11g
• oracle: other script enhancements, performance improvements and fixes
• public: performance optimize & bug fixes on lib JNLuaJIT
• public: misc fixes