pg-migrator - src: Split 3.5k line single C source file into eight

Log Message:
-----------
Split 3.5k line single C source file into eight smaller C source files,
for easier maintenance and clarity.

Modified Files:
--------------
src:
Makefile (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/Makefile.diff?r1=1.4&r2=1.5)
pg_migrator.c (r1.44 -> r1.45)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/pg_migrator.c.diff?r1=1.44&r2=1.45)

Added Files:
-----------
src:
exec.c (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/exec.c?rev=1.1&content-type=text/x-cvsweb-markup)
file.c (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/file.c?rev=1.1&content-type=text/x-cvsweb-markup)
info.c (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/info.c?rev=1.1&content-type=text/x-cvsweb-markup)
misc.c (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/misc.c?rev=1.1&content-type=text/x-cvsweb-markup)
pg_migrator.h (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/pg_migrator.h?rev=1.1&content-type=text/x-cvsweb-markup)
relfilenode.c (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/relfilenode.c?rev=1.1&content-type=text/x-cvsweb-markup)
server.c (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/server.c?rev=1.1&content-type=text/x-cvsweb-markup)
util.c (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pg-migrator/src/util.c?rev=1.1&content-type=text/x-cvsweb-markup)