TS-3151: Extra check for background fill to avoid crash.
TS-3149: add traffic_via command

Move Via header decoding from traffic_line to a new command,
traffic_via. This closes #133.
TS-3149: remove debug printf
[TS-2683]: Enhance the bg fetch plugin to support specifyng various exclusion criteria
update CHANGES
Fic launchctl invocation in startup script
[TS-2682] Add per remap support for background fetch plugin
update CHANGES
[TS-2682]: Update plugin docs for per-remap support
Update the docs for per-remap support of background fetch plugin
update the plugin docs with more clarification on the optional config file
[TS-2683] Addressing review comments from James Peach
[TS-2862]: Addressing review comments from James Peach
[TS-2682]: cleanup based on review comments from James Peach
update docs for background fetch exclude config file
minor error log correction
correct documentation
Cosmetic changes on old code and new code from TS-2682
Doc: first pass at release process documentation.
Update STATUS for 5.1.1