Release 7.1.0

• code: changed the query table allocation method (215c12f)
• code: updated query performance example stats (cf79300)
• code: added entity-owner pairing boosting speed of world_query (ecfb521)
• Merge branch 'master' of github.com:zpl-c/librg (4bff059)
• code: switched to no-copy, direct write query results (3f2cbb4)
• code: minor code re-organizations (ccfb705)
• code: added app for testing query performance (b76ba24)
• misc: updated makefile to support selective app building (fa90cc9)
• code: updated zpl (9987e50)