Timescaledb: 1.7.1 Release

This maintenance release contains bugfixes since the 1.7.0 release. We deem it medium priority for upgrading and high priority for users with multiple continuous aggregates.

In particular the fixes contained in this maintenance release address bugs in continuous aggregates with real-time aggregation and PostgreSQL 12 support.

Bugfixes * #1834 Define strerror() for Windows * #1846 Fix segfault on COPY to hypertable * #1850 Fix scheduler failure due to bad next_start_time for jobs * #1851 Fix hypertable expansion for UNION ALL * #1854 Fix reorder policy job to skip compressed chunks * #1861 Fix qual pushdown for compressed hypertables where quals have casts * #1864 Fix issue with subplan selection in parallel ChunkAppend * #1868 Add support for WHERE, HAVING clauses with real time aggregates * #1869 Fix real time aggregate support for multiple continuous aggregates * #1871 Don't rely on timescaledb.restoring for upgrade * #1875 Fix hypertable detection in subqueries * #1884 Fix crash on SELECT WHERE NOT with empty table

Thanks * @airton-neto for reporting an issue with queries over UNIONs of hypertables * @dhodyn for reporting an issue with UNION ALL queries * @frostwind for reporting an issue with casts in where clauses on compressed hypertables * @fvannee for reporting an issue with hypertable detection in inlined SQL functions and an issue with COPY * @hgiasac for reporting missing where clause with real time aggregates * @louisth for reporting an issue with real-time aggregation and multiple continuous aggregates * @michael-sayapin for reporting an issue with INSERTs and WHERE NOT EXISTS * @olernov for reporting and fixing an issue with compressed chunks in the reorder policy * @pehlert for reporting an issue with pg_upgrade

The music for this release was the Rolling Stone's Sticky Fingers.