Cell need paragraph in the end.
2. InsertTableBeforeSelf(Table t) behaviour changed, now it returns completely new table copied from parameter table.
3. InsertParagraphAfterSelf(Paragraph p) behaviour changed, now it returns completely new paragraph copied from parameter paragraph, but only in case for this is Paragraph
4. InsertTableAfterSelf(Table t) the same as for InsertTableBeforeSelf behaviour changed, now it returns completely new table copied from parameter table.

P.S. Look please my //IMPORTANT notes in code.