getter/setters: For ProtocolFileBuirder.

* src/dctc/java/com/dataiku/dctc/file/ProtocolFileBuilder.java:
  getBank, setBank, withBank.
* src/dctc/java/com/dataiku/dctc/file/FTPFileBuilder.java,
  src/dctc/java/com/dataiku/dctc/file/GSFileBuilder.java,
  src/dctc/java/com/dataiku/dctc/file/HdfsFileBuilder.java,
  src/dctc/java/com/dataiku/dctc/file/S3FileBuilder.java,
  src/dctc/java/com/dataiku/dctc/file/SshFileBuilder.java: Adjust.
dku-utlis: Correct encoding.

* src/core/java/com/dataiku/dip/utils/DKUtils.java: Here.
* src/core/java/com/dataiku/dip/utils/StreamUtils.java: New method for
  file descriptor. Factorize default encoding.
dku-utils: Prefer string builder

* src/core/java/com/dataiku/dip/utils/DKUtils.java: to string
  concatenation.
encoding: Again.
warn: Need to cast to long.

* src/core/java/com/dataiku/dip/utils/DKUtils.java: Add long instead
  of int.
style: Spaces.
style: Indent.

* src/core/java/com/dataiku/dip/utils/DoubleList.java: Here.
double-list: Change visibility.

* src/core/java/com/dataiku/dip/utils/DoubleList.java: public ->
  protected for getAllData. This method is not used elsewhere.
* src/core/java/com/dataiku/dip/utils/InheritableNDC.java: public ->
  private for itl.
delete useless attribute.

* src/core/java/com/dataiku/dip/utils/LazyHashMap.java: Here.
color: Clean attribute.

* src/core/java/com/dataiku/dip/utils/Color.java: getter/setter.