this was just supposed to add parallel uploads/downloads
and it does do that, but i then found a bunch of bugs
with respect to path handling that i thought i had under
control. oops.
so this adds a ton of tests and tries to make the logic
in ulloc to be more consistent. almost all of the actual
file handling bits and knowledge happens in cmd_cp now
where it should belong.
additionally, the s3 command has the behavior that if your
bucket has the file s3://bucket/file, then executing
s3 ls s3://bucket/fi returns nothing. this change makes
uplinkng match that behavior even if i don't personally
like it.
a big portion of the weirdness is the concept introduced
that i've named "directoryish", which intends to capture
the behavior that if a user copies a file to that location
then the base name of the source should be appended on
rather than a direct copy. this concept is entirely a
based on the string value and not the actual filesystem
state. hence, the cp command is responsible for checking
if local paths are actually a directory, and adding a
trailing slash if necessary to make them "directoryish".
additionally, the empty key for a bucket and the empty
string for local paths are considered "directoryish".
Change-Id: I9120d18616fd813b29ff81beed4f5993caa99fb6
08d860570b