Thread: pgsql: Rename miscadmin.h's PG_VERSIONSTR macro to PG_BACKEND_VERSIONSTR

Log Message:
-----------
Rename miscadmin.h's PG_VERSIONSTR macro to PG_BACKEND_VERSIONSTR to
make it a bit clearer what it is, and get rid of duplicate definitions
in initdb and pg_ctl.

Modified Files:
--------------
    pgsql/src/backend/postmaster:
        postmaster.c (r1.551 -> r1.552)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/postmaster.c?r1=1.551&r2=1.552)
    pgsql/src/bin/initdb:
        initdb.c (r1.152 -> r1.153)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/initdb/initdb.c?r1=1.152&r2=1.153)
    pgsql/src/bin/pg_ctl:
        pg_ctl.c (r1.93 -> r1.94)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_ctl/pg_ctl.c?r1=1.93&r2=1.94)
    pgsql/src/include:
        miscadmin.h (r1.200 -> r1.201)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/miscadmin.h?r1=1.200&r2=1.201)