BUG #7505: Backslash escaping not necessary

The following bug has been logged on the website:

Bug reference:      7505
Logged by:          Jeff Ovadya
Email address:      ovadyaj@gmail.com
PostgreSQL version: 9.1.4
Operating system:   PostgreSQL 9.1.4, compiled by Visual C++ build 150
Description:        =


INSERT INTO customer VALUES ( 20, 'Mr', 'Jeff', 'Baggott', 'Midtown Street
A\\33', 'Milltown', 'MT9 8NQ', '746 3956'); results in two backslashes
instead of a single one. =


Inserting the address with a single backslash succeeds in saving the
backslash with the address.

Also noticed similar issue escaping single quotes: Backslash will not work
to escape, but doubling up the quotes works.