/README.TXT: Full database import: documented that CPU load warning e-mails can safely be ignored. they happen because the parallel imports use all the available cores.

fix: lib/common.Makefile: $(nice): use an increment of +10 instead of +5 because +5 still leaves the shell sluggish

lib/common.Makefile: added $(nice) and use it everywhere its definition is used

/README.TXT: Full database import: exiting `screen`: clarify that you must use `exit`, as Ctrl+D gets disabled to prevent accidental exits

/README.TXT: Full database import: added step to restart Postgres to free up any disk space used by temp tables from the last import (this is apparently not automatically reclaimed)

/Makefile: postgres_restart-Linux: documented that the manual running of the command is needed because for some reason, pg_ctl does not work when run inside make

fix: /Makefile: postgres_restart-Linux: added pause after telling the user the command to run

/Makefile: $(postgresReload-*): use postgres_restart for the postgres-restarting step

bugfix: /Makefile: postgres_restart: added separate Linux version that deals with Linux-specific issues (as in $(postgresReload-Linux))

/Makefile: added postgres_restart, since this is often invoked separately from the entire postgres_reload target