Setting consistent default values for `save_history`

Setting the default values for `save_history` in all places to `0` so it is consistent.

We can't set it to `1` by default since we don't enable the feature on an update and the parameter also is used in global layout files which may be used by extensions who don't support versioning.

Based on an issue raised in the Google Groups:
https://groups.google.com/d/msg/joomlabugsquad/Bxtii_EPFdE/CAuLZdlpdvgJ

Related Tracker:
http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=32347&start=0