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Changeset r1561 added option to send empty Authorization header, to work with IMS. But it is reported that this empty Authorization header is not removed once the actual Authorization header is created.

This is useful when creating a new call as the result of redirection, as RFC 3261 recommends that the same Call-ID should be used. Thanks P.J.Cast for the suggestion.

Implement handling of call redirection in PJSUA-LIB:

• a callback to notify application that the call is being redirected
• application may accept, reject, or delay the redirection processing later (for example, to ask for user permission)
• when application accepts the redirection, pjsua-lib will try the new destinations sequentially

To maintain backward compatibility with existing applications, pjsua-lib will not follow redirection if the callback is not implemented by application.