Keyword research : local propers : give a bonus

[paucazou]

We should give a bonus to feasts matching with tokens if they belong to the proper requested, or if they belong to a proper which is above the proper requested.
Examples:

• I'm looking for St Theresa in the french proper: the feast which belongs to the french proper must be above the one belonging to the roman proper.
• Similar research, but with the parisian proper: the feast which belongs to the french proper must be above the one belonging to the universal proper, because the parisian proper is inside the french one.

The bonus should be no more than 1%, else it could skew results.

[paucazou]

Will be done for 0.6.0, when the keyword research will be completely reworked.