Improve handling of getaddrinfo() on AIX (Tom)

This fixes a problem with starting the statistics collector, among other things.

Fix “failed to re-find parent key” errors in VACUUM (Tom)

Fix race condition for truncation of a large relation across a gigabyte boundary by VACUUM (Tom)

Fix bugs affecting multi-gigabyte hash indexes (Tom)

Fix possible deadlock in Windows signal handling (Teodor)

Fix error when constructing an ARRAY[] made up of multiple empty elements (Tom)

Fix ecpg memory leak during connection (Michael)

to_number() and to_char(numeric) are now STABLE, not IMMUTABLE, for new initdb installs (Tom)

This is because lc_numeric can potentially change the output of these functions.

Improve index usage of regular expressions that use parentheses (Tom)

This improves psql \d performance also.

Update timezone database

This affects Australian and Canadian daylight-savings rules in particular.