[pgpool-committers: 7738] pgpool: Add release notes.

[Bo Peng]

Add release notes.

Branch
------
V4_1_STABLE

Details
-------
https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=df3fee6983dd5bc70af53d3d4c6293cb765ce2fc

Modified Files
--------------
doc.ja/src/sgml/release-3.6.sgml |  80 +++++++++++++++++
doc.ja/src/sgml/release-3.7.sgml |  89 +++++++++++++++++++
doc.ja/src/sgml/release-4.0.sgml |  99 +++++++++++++++++++++
doc.ja/src/sgml/release-4.1.sgml | 181 +++++++++++++++++++++++++++++++++++++++
doc.ja/src/sgml/version.sgml     |   2 +-
doc/src/sgml/release-3.6.sgml    |  71 +++++++++++++++
doc/src/sgml/release-3.7.sgml    |  80 +++++++++++++++++
doc/src/sgml/release-4.0.sgml    |  90 +++++++++++++++++++
doc/src/sgml/release-4.1.sgml    | 171 ++++++++++++++++++++++++++++++++++++
doc/src/sgml/version.sgml        |   2 +-
10 files changed, 863 insertions(+), 2 deletions(-)