update case E_6
copy realclassify.tex to realclassify_1.tex and realclassify_2.tex
remove realclassify.tex
remove sections on unimodal sing. from realclassify_1.tex
introduce short title

+ introduce new commands and operators
update abstract
update introduction
update section on the Splitting Lemma
update the table of normal forms
add new section Prerequisites

+ move factorization results to there
apply some minor changes
restructure sections and subsections