Added new d/u/metadata file (complete)

Reference:

 - Author: Avner Schlessinger and Guy Yachdav and Burkhard Rost 

   Journal: Bioinformatics

   Year: 2006 Apr 1

   Volume: 22

   Number: 7

   Pages: 891-893

   Title: OPRFbval: predict flexible and rigid residues in proteins

   PMID: 16455751

   DOI: 10.1093/bioinformatics/btl032

   URL:  https://academic.oup.com/bioinformatics/article/22/7/891/202796

   ePrint: "https://academic.oup.com/bioinformatics/article-pdf/\

    22/7/891/523458/btl032.pdf"

Registry:

 - Name: OMICtools

   Entry: OMICS_09791

 - Name: bio.tools

   Entry: NA

 - Name: SciCrunch

   Entry: NA