fix: Delete switch warning.

* src/core/java/com/dataiku/dip/partitioning/TimeDimensionValue.java:
  Add SuppressWarnings statements.
pretty string: quoting method take an Object instead of a String.

* src/dctc/java/com/dataiku/dctc/PrettyString.java: Here.
fix: Spaces update.
Use a StringBuilder instead of String concatenation.

* src/dctc/java/com/dataiku/dctc/PrettyString.java: Here.
rename: EndOfCommandException -> EndOfCommand.

* src/dctc/java/com/dataiku/dctc/command/Command.java: Here.
* src/dctc/java/com/dataiku/dctc/Main.java,
  src/dctc/java/com/dataiku/dctc/file/FTPFileBuilder.java: Adjust.
gfile: createSubFile with no path translation.

* src/dctc/java/com/dataiku/dctc/file/AbstractGFile.java,
  src/dctc/java/com/dataiku/dctc/file/GeneralizedFile.java: Here.
clean: Refactor.

* src/dctc/java/com/dataiku/dctc/file/FileBuilder.java: Here.