ref #1460 [Missing and incomplete frames on  wire]

- fixed playout mechanism for the frames with inferred playout duration
- fixed interest lifetime calculations
- fixed detection of frame readiness
- added statistics logging
ref #1460 [Missing and incomplete frames]

- added checks for interest lifetime calculations
- code cleanup
[untracked] headless mode

- added headless mode to config file
- fixed default config jitter size
[untracked] erroneous parity data requests

fixed erroneously issuing interests for parity data when FEC is disabled
[untracked] bugfixes for FEC-enabled mode

- FEC enabled by default
- fixed missing segment refinement: upon receiving first segment -
determining of missing data/parity segments was wrong. fixed this