FGDC writer time-currentness tag is in wrong location

[stansmith907]

The FGDC writer outputs the time currentness tag in the wrong location. This is happening in both the data identification and linage source sections.

Data identification section should be:

    <timeperd>
      <timeinfo>
        <sngdate>
          <caldate>2017-12-01</caldate>
          <time/>
        </sngdate>
      </timeinfo>
      <current>time info currentness</current>
    </timeperd>

Lineage source section should be:

        <srctime>
          <timeinfo>
            <rngdates>
              <begdate>2017-12-17</begdate>
              <begtime/>
              <enddate>2017-12-18</enddate>
              <endtime/>
            </rngdates>
          </timeinfo>
          <srccurr>description</srccurr>
        </srctime>