Delete throws from Command.

* src/dctc/java/com/dataiku/dctc/Main.java
  src/dctc/java/com/dataiku/dctc/command/AddAccount.java
  src/dctc/java/com/dataiku/dctc/command/Command.java
  src/dctc/java/com/dataiku/dctc/command/Find.java
  src/dctc/java/com/dataiku/dctc/command/Grep.java
  src/dctc/java/com/dataiku/dctc/command/ListCommand.java
  src/dctc/java/com/dataiku/dctc/command/Ls.java: And adjust.