Unogenerator

- unogenerator_translator. Entries in po files are now sorted by comment.

- Now you can use with statement with ODF classes.
- Added Coord, Range, ColorsNamed to unogenerator import.
- Added skip_up and skip_down parameters to getvalues().
- addListOfRows and addListOfColumns now returns created range.
- Added VerticalBoldCenter style to standard.ods template

- Improved installation methods documentation at [INSTALL.md](INSTALL.md)
- Fix bug with missing keys parameter

- Improved log and debug system.
- ODS.addListOfRowsWithStyle is now almost instant with lots of cells.
- helper_list_of_ordereddicts now uses ODS.addListOfRowsWithStyle to improve doc generation.

- Fixed error when percentage value is None.
- Fixed problem translating demo documents.

- ODS.addCell is now used to change values or strings, but doesn't change defined property styles, if they aren't defined