Log Message:
update devel/jsonnet to version 0.10.0

- One major change: The formatter (jsonnet fmt) is now more opinionated [...]
- Minor additions:
  - jsonnet -y and -m now respect -o
  - JSONNET_PATH environment variable
  - { [null]: true for x in [3] } now respects the null instead of being an error
  - The parser takes much less stack space
  - std.strReplace(str, from, to)
  - std.isArray(v), std.isBoolean(v), std.isFunction(v), std.isNumber(v),
    std.isObject(v), std.isString(v)
  - std.sign(n)
  - std.asciiUpper(x), std.asciiLower(x)
  - std.manifestYamlDoc(value), std.manifestYamlStream(value)
  - std.manifestXmlJsonml(value) (see jsonml.org)
  - ...and minor bug fixes & performance improvements