Add --and-pii option to `emit-xml`. Closes #2285.

With this option, `emit-xml` generates VDR XML both with and without
PII simultaneously (i.e., from the same database reads). This should
halve the time it takes (post-ETL) to generate the XML for the
standard VDR submission scenario.
Add --directory option for `emit-xml`. Closes #3073.
Use consistent spacing between bullets.