s3: Correct file listing.

* src/dctc/java/com/dataiku/dctc/file/S3File.java: Here.
ftp: Avoid NullPointerException.

* src/dctc/java/com/dataiku/dctc/file/FTPFile.java: Here.
Flush the stdout.

* src/core/java/com/dataiku/dip/utils/StdOut.java: Here.
ssh: Flush when needed.

* src/dctc/java/com/dataiku/dctc/configuration/SshUserInfo.java: Here.
command: Display usage unrecognized option is given.

* src/dctc/java/com/dataiku/dctc/command/Command.java: Here.
get direct son: Correct it.

* src/dctc/java/com/dataiku/dctc/file/FileManipulation.java: Here.
Clarify error message.

* src/dctc/java/com/dataiku/dctc/command/Command.java: When globbing
  throw an IOException.
Clean Global Conf.

* src/dctc/java/com/dataiku/dctc/Main.java: Set the global
  configuration.
* src/dctc/java/com/dataiku/dctc/configuration/CredentialProviderBank.java:
  Manage only credential, no more.
style: Sort attributes.

* src/dctc/java/com/dataiku/dctc/configuration/CredentialProviderBank.java:
  Here.
Delete debug message.