Control grib collection catalog listings (names, order)

updated gribCollections to allow for renaming of latest file and best ti...me series datasets, as well as allow for the sorting of files as shown under the files catalog listing.

Catalog Example (using nam12 on /data mount):

<dataset name="NAM 12km Test">
  <featureCollection name="NAM_12km" featureType="GRIB" harvest="true" 
                                        path="grib/NCEP/NAM/12km">
    <collection spec="/data/ldm/nam_12km/.*grib2$"
                     dateFormatMark="#nam_12km_#yyyyMMddHHmm"
                     olderThan="5 min"/>
    <tdm startup="false" rescan="0 0/15 * * * ? *" trigger="allow"/>
    <gribConfig datasetTypes="Best LatestFile Files">
      <latestNamer name="My Latest Name"/>
      <bestNamer name="My Best Name" />
      <filesSort>
        <lexigraphicByName increasing="false" />
      </filesSort>
    </gribConfig>
  </featureCollection>
</dataset>

The <latestNamer> element controls how the Latest Dataset is listed in the catalog; similairy for the bestNamer name and the Best Timeseries. The <filesSort> controls how the files are listed in the "files" sublisting in the gribCollection catalogs. If increasing is true in the lexigraphicByName tag, then the files are listed from oldest to newest; if increasing is false, then the files are listed from newest to oldest.