Buffer incoming tcp data until we receive a complete metric
Initialise tcp buffer to empty string
Add crude test for input buffering on tcp server
Add metrics_received counter

Similar to packets_received, but counts individual (good or bad) metrics lines
received
Add documentation for server modules
Add server documentation links
Add XXX notes on implementation oddities
doc: describe keyFlush default and deleteIdleStats
doc: fix markup
fixup! doc: document internal stats metrics

surely there is a better place...
doc: expand on handling of metrics