pgAdmin III commit: Improve the commenting logic in the SQL text box, t

Improve the commenting logic in the SQL text box, to allow quick commenting of multiple lines in succession and fix
someunintuitive behaviour. 

Branch
------
master

Details
-------
http://git.postgresql.org/gitweb?p=pgadmin3.git;a=commitdiff;h=8b1ece55bcd700fef5882f4623a4cb5075df6624
Author: Nail Samatov <nail.samatov@googlemail.com>

Modified Files
--------------
CHANGELOG                 |    3 ++
pgadmin/ctl/ctlSQLBox.cpp |   55 +++++++++++++++++++++++++++++++++++++++-----
2 files changed, 51 insertions(+), 7 deletions(-)