Large profiling fix

This tries to keep the size of a profiling message under 8,000 characters (parsing problems occur around 8,160) by splitting the calls over multiple applogs. 

*_local_cache* sits in instance memory, and is updated from (or from the non-existence of) the memcache item, 
*appstats-logger_use-plaintext* at most once every 10 minutes. By default, profiling messages will be compressed.

@isaacstauffer-wf
@robertkluin-wf