New functionality:

1. filtering(removal) of too short or too long solitary "m" tags
2. filtering of empty "o" tags
3. reformating of xml output to move "o" tags into "r","m" or "s","m" i.e. <datafield tag="999" ind1="C" ind2="5"> <subfield code="o">1.</subfield> <subfield code="m">J. Dukelsky, S. Pittel and G. Sierra,</subfield> <subfield code="s">Rev. Mod. Phys. 76 (2004) 643</subfield> </datafield>