* Issue **#1159** : Fix NPE in rolling appenders with no frequency value.

* Issue **#1160** : Proxy repositories will no longer scan contents on open if they are set to be read only.

* Issue **#1162** : Added buffering etc to improve the performance of proxy aggregation.

* Issue **#1156** : Added code to reduce unlikely chance of NPE or uncontrolled processing in the event of a null or empty processing filter.