moved helper fxns for multiargs to zzz file, cleaned out old code
now solr_search with r like create vector instead of comma sep string, #22
solr_highlight now accepts vector instead of comma sep string for hl.fl param, #22
solr_stats now accepts vector instead of comma sep string all applicable params, #22
solr_mlt now accepts vector instead of comma sep string all applicable params, closes #22