ACCOUNTING - Add Req mem to the job record

doc/man/man1/sacct.1

slurm/slurmdb.h

src/common/slurmdb_pack.c

src/common/slurmdbd_defs.c

src/common/slurmdbd_defs.h

...ugins/accounting_storage/mysql/accounting_storage_mysql.c

src/plugins/accounting_storage/mysql/as_mysql_archive.c

src/plugins/accounting_storage/mysql/as_mysql_convert.c

src/plugins/accounting_storage/mysql/as_mysql_job.c

...ugins/accounting_storage/mysql/as_mysql_jobacct_process.c

...accounting_storage/slurmdbd/accounting_storage_slurmdbd.c

src/sacct/print.c

src/sacct/sacct.c

src/sacct/sacct.h

src/slurmdbd/proc_req.c