Implement database external size calculations

This patch adds calculations to show the "external size" of a database
which is roughly a measure of how much disk space it would take to store
the contents of the database in flat files. It is used to calculate
rough compression ratios for capacity planning.

5 files changed
tree: d024ae9753c8949ee448aaeeb218e110dafc8e49
  1. .gitignore
  2. include/
  3. priv/
  4. rebar.config.script
  5. src/