OF-1200: Work in progress
This is a very basic (and inefficient, and prone to cause thread starvation) change that causes
MAM queries to be responded to only after all relevant data has become available in the database.
OF-1487: Monitoring plugin: write archived data to the database more often.
Prior to this commit, archived data was kept in a buffer, which was flushed to the database once per minute.
It is undesirable to have the database 'lag behind' for such an extend period of time.
This commit introduces near-instantanious flushes. Data that's put in a buffer is flushed immediately, unless
more data is available instantly.
