Additions to config file

[g7gpr]

These support quota management by disc use and deleting captured directories by count.

[Cybis320]

We should try to keep to a 80-character line limit. The comments are exceeding that a little.

[Cybis320]

This line break keeps it under 80:

; disabling quota management generates the reports, lists the files that would
; be deleted but prevents any action from being taken
; true = disabled, false = enabled

quota_management_disabled: true

; any one of the next three parameters missing or commented out disables the
; quota management each of the parameters is in GB.

[Cybis320]

@g7gpr, What is the status on this? I see that the quota management was merged into ConfigReader and DeleteOldObservation but not the associated config options. Should we reopen this PR? See issue #387

[g7gpr]

Yes, we should reopen. I deleted my branch as I thought this had been merged.