Option to choose AND instead of OR as default conjunction operator

[Gordian]

Right now, the OR operator is the default conjunction operator. This means that if there is no Boolean operator between two terms, the OR operator is used.

This seems couterintuitive to many users (Google uses AND as default operator).

The admin should therefore have the option to set "AND" as the general default search operator instead of "OR" for all users.

[car031]

This setting can be already done in the file repository\index\conf\schema.xml

<solrQueryParser defaultOperator="OR"/>