pgsql: Add E'' to internally created SQL strings that contain

Log Message:
-----------
Add E'' to internally created SQL strings that contain backslashes.

Improve code clarity by using macros for E'' processing.

Modified Files:
--------------
    pgsql/src/backend/utils/adt:
        quote.c (r1.15 -> r1.16)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/quote.c.diff?r1=1.15&r2=1.16)
        ruleutils.c (r1.202 -> r1.203)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/ruleutils.c.diff?r1=1.202&r2=1.203)
    pgsql/src/bin/initdb:
        initdb.c (r1.89 -> r1.90)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/initdb/initdb.c.diff?r1=1.89&r2=1.90)
    pgsql/src/bin/pg_dump:
        dumputils.c (r1.18 -> r1.19)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/dumputils.c.diff?r1=1.18&r2=1.19)
        pg_dump.c (r1.412 -> r1.413)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_dump.c.diff?r1=1.412&r2=1.413)
    pgsql/src/bin/psql:
        describe.c (r1.119 -> r1.120)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/describe.c.diff?r1=1.119&r2=1.120)
        large_obj.c (r1.38 -> r1.39)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/large_obj.c.diff?r1=1.38&r2=1.39)
    pgsql/src/include:
        c.h (r1.186 -> r1.187)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/c.h.diff?r1=1.186&r2=1.187)
    pgsql/src/interfaces/ecpg/ecpglib:
        execute.c (r1.40 -> r1.41)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/execute.c.diff?r1=1.40&r2=1.41)
    pgsql/src/interfaces/ecpg/preproc:
        preproc.y (r1.307 -> r1.308)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/preproc.y.diff?r1=1.307&r2=1.308)
    pgsql/src/interfaces/libpq:
        fe-exec.c (r1.169 -> r1.170)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/fe-exec.c.diff?r1=1.169&r2=1.170)
    pgsql/src/pl/plpgsql/src:
        gram.y (r1.79 -> r1.80)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/gram.y.diff?r1=1.79&r2=1.80)