bugfix: bin/import_all: need to run delete_logs manually because `trap EXIT` doesn't run until bg cmds done

bin/import_all: delete_logs: moved testing of whether to delete logs to delete_logs() so that delete_logs() can be run regardless of the $delete_logs setting

bugfix: bin/import_all: delete_logs(): also need to match log filenames when n=""

bugfix: /Makefile: postgres_restart-*: argument to echo always needs quotes

bugfix: /Makefile: $(pg_ctl-*): tell user that if it doesn't work, need to run `rm $(macPostgresDir)/postmaster.pid` and retry

/Makefile: $(pg_ctl-Darwin): documented the pg_ctl version of this command in case `brew services` doesn't work

bugfix: bin/with_all: isset(): need to use `>&- 2>&-` because &> does not work with - as the dest

fix: config/VirtualBox_VMs/vegbiendev/README.TXT: to test the import: determine if the revision works: use the in# of the query instead of waiting an arbitrary time, because this is more accurate in determining whether the import is successful

config/VirtualBox_VMs/vegbiendev/README.TXT: regressions that occurred during the revision range: named these "concurrent regressions"

fix: config/VirtualBox_VMs/vegbiendev/README.TXT: to test the import: need to update system time so wait times can be calculated correctly