Tidy things up a bit
Minor reorg
More reorg
Yet more reorg
Eliminate duplicate data extraction functions
Capitalize functions in FitMsg interface
Don't add 'pos' to NewMsg* if there are no fields
Move ANT+ FIT code to separate package
Break monolithic file into smaller chunks
Rename ant_fit.go to msgs.go

--HG--
rename : src/ant-fit/ant_fit.go => src/ant-fit/msgs.go
Fix last few problems
Build Go messages from Java sources
Dump ANT+ FIT file