isync GPL incompatibility due to Cyrus SASL

[Oswald B. <osw...@gm...>]

moin,

debian bug #1012636 has brought to my attention that the SASL support 
introduced in isync v1.2 (commit eb100515) makes isync binaries built 
with it not legally distributable (unless SASL is a system library).

to address this issue, i intend to generalize the GPL exception as per 
the attached patch.

i just updated the AUTHORS file to accurately reflect the copyright 
holders and other contributors, as can be determined from the CVS/git 
history. every contributor is invited to verify their classification.

ideally, every copyright holder will reply to this message on-list to 
express their agreement to the license change. in a while, i'll send out 
individual mails for missing confirmations.

because
- isync already contains an exception for OpenSSL,
- every contributor implicitly agreed to that exception, and
- that exception exists specifically because of the advertising clause 
   in OpenSSL < v3's license,
i'm assuming that everyone will be fine with the proposed change.
i'll rely on that assumption in case some copyright holder(s) cannot be 
reached.

thanks