Release notes: 4.6.0
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S.Weisse: contract renewal strategy for scheduled properties


TINE_EXPORT void SetSystemSubscriptionRenewalLength(int value);
-> one size fits all : server side call


SetConnectionRenewalThreshold(int linkId, float percent)
{
  // find canonical subscription length for link 'linkId'
  // establish 'renewal request' at counter < length * percent

}