patch from Hongjia Cao for renaming files and functions

src/plugins/accounting_storage/pgsql/Makefile.am

src/plugins/accounting_storage/pgsql/Makefile.in

...ugins/accounting_storage/pgsql/accounting_storage_pgsql.c

src/plugins/accounting_storage/pgsql/as_pg_acct.c

src/plugins/accounting_storage/pgsql/as_pg_acct.h

src/plugins/accounting_storage/pgsql/as_pg_archive.c

src/plugins/accounting_storage/pgsql/as_pg_archive.h

src/plugins/accounting_storage/pgsql/as_pg_assoc.c

src/plugins/accounting_storage/pgsql/as_pg_assoc.h

src/plugins/accounting_storage/pgsql/as_pg_cluster.c

src/plugins/accounting_storage/pgsql/as_pg_cluster.h

src/plugins/accounting_storage/pgsql/as_pg_common.c

src/plugins/accounting_storage/pgsql/as_pg_common.h

src/plugins/accounting_storage/pgsql/as_pg_event.c

src/plugins/accounting_storage/pgsql/as_pg_event.h

src/plugins/accounting_storage/pgsql/as_pg_job.c

src/plugins/accounting_storage/pgsql/as_pg_job.h

src/plugins/accounting_storage/pgsql/as_pg_problem.c

src/plugins/accounting_storage/pgsql/as_pg_problem.h

src/plugins/accounting_storage/pgsql/as_pg_qos.c