Remove unused code and add serialVersionUIDs to get rid of warnings
Remove unused code and add serialVersionUIDs to get rid of warnings

sauliusg/jabref,zellerdev/jabref,bartsch-dev/jabref,mairdl/jabref,tobiasdiez/jabref,shitikanth/jabref,motokito/jabref,Mr-DLib/jabref,Siedlerchr/jabref,tobiasdiez/jabref,shitikanth/jabref,mairdl/jabref,shitikanth/jabref,motokito/jabref,tobiasdiez/jabref,motokito/jabref,Mr-DLib/jabref,oscargus/jabref,oscargus/jabref,zellerdev/jabref,Mr-DLib/jabref,mredaelli/jabref,mredaelli/jabref,mairdl/jabref,obraliar/jabref,zellerdev/jabref,shitikanth/jabref,mairdl/jabref,ayanai1/jabref,mredaelli/jabref,zellerdev/jabref,ayanai1/jabref,grimes2/jabref,bartsch-dev/jabref,bartsch-dev/jabref,grimes2/jabref,Braunch/jabref,tschechlovdev/jabref,oscargus/jabref,tschechlovdev/jabref,mredaelli/jabref,Braunch/jabref,Mr-DLib/jabref,jhshinn/jabref,obraliar/jabref,obraliar/jabref,sauliusg/jabref,JabRef/jabref,grimes2/jabref,jhshinn/jabref,motokito/jabref,Braunch/jabref,Braunch/jabref,grimes2/jabref,ayanai1/jabref,tschechlovdev/jabref,mairdl/jabref,sauliusg/jabref,obraliar/jabref,Siedlerchr/jabref,Mr-DLib/jabref,grimes2/jabref,JabRef/jabref,mredaelli/jabref,oscargus/jabref,obraliar/jabref,ayanai1/jabref,jhshinn/jabref,zellerdev/jabref,JabRef/jabref,Siedlerchr/jabref,tschechlovdev/jabref,oscargus/jabref,shitikanth/jabref,Braunch/jabref,tobiasdiez/jabref,Siedlerchr/jabref,ayanai1/jabref,motokito/jabref,bartsch-dev/jabref,bartsch-dev/jabref,tschechlovdev/jabref,sauliusg/jabref,jhshinn/jabref,jhshinn/jabref,JabRef/jabref