Make annotation_rangeTimeStart a sortable field in Islandora Solr

[kimpham54]

to use in the web annotation view block

[kimpham54]

• need to update the wiki with new configs
• need to update view in codebase: look into Views API instead of Views PHP (not covered under drupal's security policy)

[kimpham54]

done, updated in https://github.com/digitalutsc/islandora_web_annotations/wiki/Configuration:-Indexing-annotations-in-Solr. must define annotation_rangeTimeStart and annotation_rangeTimeStart_sort separately