Save on format rtf instead of odt

There are errors saving and loading files on odt format.
The intention of save odt files was make interoperability easier,
but abiword support of odt is weak, and we have many problems
apparently solved moving to rtf.
Do not show "speak" palette when abiword is version 3.0

Abiword 3.0 crashes when try to do get_text, and taht method is used
by the speak feature.
Do not show export to pdf  option when abiword version == 3.0

This option crashes on F21
Version 96