AMTServer 1.5.15.6

[Belinda Frick]

Version 1.5.15.6
No longer uses both AMTClient and cardserver IPs as the agent IP
for CTI devices when recording.

Version 1.5.15.5
Reversed a change made in 1.5.15.4, the device is no longer
cleared on the CardInter list.

Version 1.5.15.4
Added support for early matches.
E-mails are no longer sent for down AMTClients, as it used to be
before 1.5.15.3

Version 1.5.15.3
Added support for configuring the physical extension on the
AMTClient.
Added support for automatic upgrades of AMTClients.