<ex> cannot be child of <abbr>

[sdigiulio]

A number of files have <ex> elements that are children of <abbr>, which should not be allowed; need to fix so that they are siblings and both children of <expan>

transcribed/CA.Berk.UC.HMA.L.8-4295.xml
transcribed/ITA.Rome.AAR.L.9343.xml
transcribed/ITA.Rome.AAR.L.9347.xml
transcribed/MA.Newt.Gulotta.L.19.07.01b.xml
transcribed/MA.Newt.Gulotta.L.19.07.01b.xml
transcribed/MD.Balt.JHU.L.44.xml
transcribed/MD.Balt.JHU.L.44.xml
transcribed/MD.Balt.JHU.L.BS.114.xml
transcribed/MD.Balt.JHU.L.BS.134.xml
transcribed/MD.Balt.JHU.L.BS.136.xml
transcribed/MI.AA.UM.KM.L.2987.xml
transcribed/MI.AA.UM.KM.L.817.xml
transcribed/MI.AA.UM.KM.L.875.b.xml
transcribed/NY.NY.CU.Butl.L.42.xml
transcribed/NY.NY.MMA.L.03.12.7.xml
transcribed/NY.NY.MMA.L.23.160.50.xml
transcribed/NY.NY.MMA.L.23.160.50.xml
transcribed/NY.Pough.VC.L.CC41.35.xml
transcribed/PA.Phil.UP.UM.L.MS4012.xml
transcribed/PA.Phil.UP.UM.L.MS4012.xml