Bugfix in Row.Height, removing empty paragraphs in cells, Row.InsertRow keeps formatting

[VictorLoktev]

1. Last time I added the parameter removeEmptyParagraph in Paragraph.
   This time the parameter removeEmptyParagraph is added to Container.ReplaceText.
2. Now Paragraph.RemoveText is allowed to remove empty paragraphs in cells (the last paragraph in a cell stays).
3. In non-US locale Height of table row writes invalid unit value with national character and fraction. The size in units must be integer. Fixed.
4. Made an option (via parameter) to insert row in a table with cloning all elements (to keep formatting), the previous behavior was to clone tc tags only (loosing formatting).
5. Some unit tests.