XX-10021: Obfuscate CDRs (Larger companies with a workers' council have sometimes concerns about the data privacy of the cdrs.)

- added new settings under System > CDR
- Advanced settings: Privacy Extension to enable feature, Minimum length of extension that must be masquerade and Prefix excluded from masquerading
Merge branch 'XX-10021' into release-4.6-unstable

Conflicts:
	sipXconfig/neoconf/src/org/sipfoundry/sipxconfig/cdr/CdrManagerImpl.java