GitLab

- disable mutex for thread-local stats

- updates to configure2.sh

- also fix small problem in hash.{h,c} for newer gcc

- created dedicated set of system processors (pthreads); optional cpu-core affinity
- run maintenance fibres in background and/or on separate scheduler/process
- add support for multiple libfibre clusters, default disabled
- re-enable stop-the-world hash table expansion
- re-enable application-level timeout mechanism
- add script 'configure2.sh' to patch Makefile for libfibre

- reduce pthread stack size

- remove unnecessary 'conn_waiting' state
- fix minor bug in transmit()

- change main thread to directly run timer loop

  to avoid moving connections between threads