droplet-sh: license problem

This tool is now under BSD license.

As a consequence, a libreadline facility is now disabled (the Ctrl-C behaviour),
because some callbacks/variables are not available with libedit-dev.

Note also that the editline headers are wrong about the entry name completion callback
prototype, so we do an ugly and explicit cast to the appropriate type.
 droplet-sh: typo
 droplet-sh: trying to "ls" a file returns weird error

We tried dpl_opendir() on the given path, possibly a file.

I added the -d option, which display attributes for the given entry, directory or regular file.
 droplet-sh: trying to "ls" a file returns weird error
 droplet-sh: allow any number of files/dirs as arguments to ls
 droplet-sh: trying to "ls" a file returns weird error
 dropletsh: rm -f option should not report errors
 dplsh: handle "ls" command to list buckets on S3
 dplsh: handle "ls" command to list buckets on S3
 droplet-sh "ls -lR" command fails to get attributes

Tested with both cdmi and s3 backends
Merge pull request #17 from scality/scality_svn

Scality svn