CALL: removed "compressed" from IOFactory
- FIX: compressed -flag was affecting only StreamCall, which ain't
  currently used; pointless to complicate API due to that
CALL: only BufferCall used; StreamCall might be removed
CALL: Improved pooling strategy for ClientHandler instances
- FIX: Prefer getting handler with matching sessionId instead of
  any random handler
	* Should improve "sessionId not changed" performance, thus
	* allow app to more easily handle multiple sessions with
	  same CallClient
- FIX: Memory leak in reserve(). If handler was dead, then it was
  never removed from mHandlers
- FIX: Extra insurance for unproperly cleaned handlers
CALL: option to reset ticket in test client on every iteration