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Attention @maybebtc @mappum

I cleaned up + simplified the main flow. Now, all printing
is contained inside main itself! (:cheer:). I do this with
the help of a cmdInvocation struct that has both
a Parse and Run. The only major clunkiness left is that the
"CallCommand" is still its own function. But *shrug*.

Please test it works as we would expect. i changed much of
the flow, so likely that i missed a complicated edge case.

main roadmap:
- parse the commandline to get a cmdInvocation
- if user requests, help, print it and exit.
- run the command invocation
- output the response
- if anything fails, print error, maybe with help

@mappum

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

* bring debug checking back to top level so we have more control over
  CPU profiling.

* bring help text up to top level so we can exit from the program
  at the top level instead of within an arbitrary function

was added 5 days ago in...

https://github.com/jbenet/go-ipfs/commit/7510ef2081e3787e97b815e69a676bd6fc75a9cd