Add support for sets to misc.javaexpr().
Add support for sets to UL4 and UL4ON.
Remove PHP from ul4on docstring.
Add a set example to the ul4on docstring.
Add a new method tasks() to sisyphus jobs.
Fix typo.
Add option maxemailerrors to sisyphus: This limits the number of exceptions
and messages attached to the failure email.
Don't use "new" in every NEWS entry.