Confusion around --repository and charm name prefix

[Andreas Hasenack]

What does this do:

1)    juju deploy --repository ~/charms mycharm

What about this:

2)    juju deploy local:mycharm

Or:

3)    juju deploy --repository ~/charms cs:mycharm


I think these are all invalid command line combinations and should error
out instead of doing the surprising thing:
1) will deploy mycharm from the charm store (bit me a few times)
2) I don't know, charm store?
3) charm store I guess?

I don't know what's the background story behind --repository and charm name
prefixes, but it seems they could mean the same thing, and yet be used in
contradictory ways.

I'm almost proposing to get rid of --repository and use bzr-like "urls"
only (which can be local paths), but as I said, I don't know the full
story, so at first what I'm proposing is:

  "make invalid combinations of --repository and charm name (qualified with
a URI or not), er,  invalid." In other words, juju should not run the
command as supplied.

See above for 3 examples of what I think are such invalid combinations.
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