config/VirtualBox_VMs/vegbiendev/README.TXT: added steps to configure the VM before booting

config/VirtualBox_VMs/vegbiendev/README.TXT: added instructions for selecting the initial snapshot and booting the VM

config/VirtualBox_VMs/vegbiendev/README.TXT: perform long-running operations inside `screen`

bugfix: config/VirtualBox_VMs/vegbiendev/README.TXT: to use a database backup: only run mk_db, not db, to avoid restoring schemas that are part of the backup

bugfix: config/VirtualBox_VMs/vegbiendev/README.TXT: pg_restore: schemas must be in dependency order

bugfix: config/VirtualBox_VMs/vegbiendev/README.TXT: pg_restore: don't restore analytical_db schema because we don't use it and it depends on public, which we're not restoring

bugfix: config/VirtualBox_VMs/vegbiendev/README.TXT: pg_restore: need to create the schema before you restore into it, to avoid cryptic error messages

bugfix: config/VirtualBox_VMs/vegbiendev/README.TXT: schemas/postgresql.conf: need to decrease shared_buffers to match VM's allocated memory (1 GB)

bugfix: config/VirtualBox_VMs/vegbiendev/README.TXT: schemas/postgresql.conf: need to decrease shared_buffers to match VM's allocated memory (1 GB)

bugfix: config/VirtualBox_VMs/vegbiendev/README.TXT: need to run `make db` to restore users, which are not part of the backup