Add attribute "reversedOrder"

[margaretha]

Vatileaks %-w1 neue means Vatileaks should not be preceded by neue.

Since a not preceded by b != b not followed by a, it is not enough to simply inverse the operands.

An new attribute "reverseOrder" is needed to indicate that the exclusion have to be inverted in Krill. In other words, the query should return the 2nd operand that is not preceded by the 1st operand, instead of the 1st operand that is not followed by the 2nd operand.

The serialization of Vatileaks %-w1 neue would be as follows.

    "@type": "koral:group",
    "distances": [
      {
        "@type": "cosmas:distance",
        "boundary": {
          "@type": "koral:boundary",
          "max": 1,
          "min": 0
        },
        "reverseOrder":true,
        "exclude": true,
        "key": "w"
      }
    ],
    "inOrder": true,
    "operands": [
      {
        "@type": "koral:group",
        "classOut": 129,
        "operands": [
          {
            "@type": "koral:token",
            "wrap": {
              "@type": "koral:term",
              "foundry": "opennlp",
              "key": "neue",
              "layer": "orth",
              "match": "match:eq"
            }
          }
        ],
        "operation": "operation:class"
      },
      {
        "@type": "koral:group",
        "classOut": 129,
        "operands": [
           {
            "@type": "koral:token",
            "wrap": {
              "@type": "koral:term",
              "foundry": "opennlp",
              "key": "Vatileaks",
              "layer": "orth",
              "match": "match:eq"              
            }
          }          
        ],
        "operation": "operation:class"
      }
    ],
    "operation": "operation:sequence"
  }

[Akron]

While not defined for distances, there is the concept of frames for operation:exclusion, we may want to adopt here instead.