MOD cleanup - more idiomatic
NOP REVU TODO extract a rotating file Writer
ADD lslib/RotatingFileWriter

Intended uses are for simulating loggers for tests/dev and
as Writer for system journal/log files e.g. tracker logs.
NOP ADD clarification for API
WIP tracking logs fsobject events for stream in rotated log

TODO the entire mechanism in command.Track to be refactored
     to lsf/lsfun.track

TODO track snapshot to be sorted by age ascending
TODO persist snapshot for stream
TODO persist log for stream
NOP cleanup
MOD insure OS safe fixed-width emits for fs.Object serialized form

NOTE: using 255 width for fnames. hfs+ is 512 (255 UTF-16 chars)
NOTE: exceeding limit here will mangle fnames in sys logs.(~ok)
NOP gofmt
NOP REVU + TODO for trackScout.Report()
ADD WIP fs.ObjectMap

ADD fs.objectIterationOrder type
ADD fs.iterationDirection - TODO is to move this up
ADD fs.ObjectMap - c.f. TODO in f7e2f809d679a9bc46798d9be506849e1d3543d3
ADD fs.objectMap - support ObjectMap
ADD WIP fs.ObjectMap

ADD various sort.Sort functions