Change to cash on cash graph: monthly vs annualized

@akmalhot Yes, the cash-on-cash graph was recently updated to respect a new “date placed in service” field for each property. We also moved the reporting over to a straight monthly metric, instead of annualized. We’re flexible on this detail. If the consensus among Stessa users is that cash-on-cash math should always be reported on an annualized basis, we can do it that way.

Also see this earlier thread: Cash on cash metric