retain metadata of org rule set

[edwindj]

Currently all simplify_ functions create a new validator object in which origin, description and creation time is renewed.

This should be improved into:

• non-changed rules should retain original meta data
• changed rules should have origin: "validatetools" and an updated description ("adapted/simplify by validate_tools")
• new rules should have origin: "validatetools" and an optional description why the rule was created.