Facet item with multiple values

[simonastoyanova]

Two cases, one in Execution, one in Place name. Both need splitting but for different reasons.

1. Multiple values in Execution
   XML: layoutDesc/layout/rs[@ana] where @ana has a dotted value, e.g. '#execution.engraved' which points to the taxonomy file https://github.com/ISicily/ISicily/blob/master/alists/ISicily-taxonomies.xml; when there are two execution values we deliberately keep them in separate rs elements:

In this case the two execution types are complimentary - the text was first engraved and then rubricated.

Example files: http://sicily.classics.ox.ac.uk/inscription/ISic001132, http://sicily.classics.ox.ac.uk/inscription/ISic000107.

2. Multiple values in Place name
   XML: origPlace/placeName[@type='ancient'] more than once. Rare but happens.

In this case the two places are alternatives, both have @cert='low' as we can't tell which one is more likely.

Example files: http://sicily.classics.ox.ac.uk/inscription/ISic020600

[geoffroy-noel-ddh]

The search can now deal properly with multiple values in places of origin and execution types files.