Changed configuration parameters

The following configuration parameters have been changed in PolicyCenter 9.0:

Parameter	Change
`ClusterMemberPurgeDaysOld`	The minimum value is now 1. The parameter is now required.
`DefaultApplicationCurrency`	Can no longer be set by environment.
`DefaultApplicationLocale`	Can no longer be set by environment.
`DefaultApplicationCurrency`	Can no longer be set by environment.
`MigrateToLargeIDsAndDatetime2`	Default changed from `false` to `true`.
`PDFMergeHandlerLicenseKey`	Can no longer be set by environment.
`UISkin`	Default changed from `Titanium` to `theme-9`.