Update to 1.402

Upstream changes:
Version 1.402, released December 19, 2012
-------------------------------------------------

[Misc]
* add Math::Complex 1.56 as recommendation (RT#81926, Sam Ferencik)
* add Math::BigInt 1.88 as recommendation (RT#81927, Sam Ferencik)
* clarify Test::Simple 1.90 is required for building (RT#81925, Sam Ferencik)

[Bug fixes]
* fix leaking reference to open tables outside SQL::Statement::execute
  (fixes RT#81523)
* looks_like_number identifies 'nan' as number sometimes (add regex to
  t/06virtual.t)

Version 1.401, released October 29, 2012
-------------------------------------------------

[Misc]
* Switch to 3-digited minor version

[Bug fixes]
* undo literal replaces in subqueries before passing them to the
  child parser
* Fix doc typo RT#76764 (STEFFENW) - thanks Steffen
* Fix typo documented in RT#71914 (reported by Ze'ev Atlas,
  fixed by H.Merijn Brand) - thanks Ze'ev and Merijn
* Fix DROP TABLE behaviour and error detection

[Improvements]
* Improve documentation/tests for multiple JOIN's from RT#69573
  (from BBYRD) with modifications
* Filling in the SQL92 gaps for functions (BBYRD) from RT#72638
  with minor modifications - thanks Brendan

(wen)