The spec test ToDateTime4 does not translate properly

[EvanMachusak]

The expected output ToDateTime4 in CqlTypeOperatorsTest is defined to be:
@2014-01-01T12:05:05.955+01:30

The converted ELM for this expression does not include the offset minutes value and produces this instead:

{
          "type" : "DateTime",
          "year" : {
            "type" : "Literal",
            "valueType" : "{urn:hl7-org:elm-types:r1}Integer",
            "value" : "2014"
          },
          "month" : {
            "type" : "Literal",
            "valueType" : "{urn:hl7-org:elm-types:r1}Integer",
            "value" : "1"
          },
          "day" : {
            "type" : "Literal",
            "valueType" : "{urn:hl7-org:elm-types:r1}Integer",
            "value" : "1"
          },
          "hour" : {
            "type" : "Literal",
            "valueType" : "{urn:hl7-org:elm-types:r1}Integer",
            "value" : "12"
          },
          "minute" : {
            "type" : "Literal",
            "valueType" : "{urn:hl7-org:elm-types:r1}Integer",
            "value" : "5"
          },
          "second" : {
            "type" : "Literal",
            "valueType" : "{urn:hl7-org:elm-types:r1}Integer",
            "value" : "5"
          },
          "millisecond" : {
            "type" : "Literal",
            "valueType" : "{urn:hl7-org:elm-types:r1}Integer",
            "value" : "955"
          },
          "timezoneOffset" : {
            "type" : "Literal",
            "valueType" : "{urn:hl7-org:elm-types:r1}Decimal",
            "value" : "1.0"
          },
          "locator" : "89:2-89:31",
          "resultTypeName" : "{urn:hl7-org:elm-types:r1}DateTime"
        }

The timezoneOffset value is 1.0, not 1.5 as expected.

[JPercival]

Fix pending review here: #1313