Added hack in order to sanitize the ressources which have protocol = "ESRI:AIMS--http-get-feature" or "ESRI:AIMS--http-get-image"

Updated es_template in order to avoid indexing some fields as full-text.

- Introduced a template entry for the nested datatype (used, for the time being, for "responsibleParty").
- Enriched metadata with the projections per service and bounding boxes per projection.
- Splitted 'protocol' into 'formats' and 'service'.
- Added a timeout to the connections to RabbitMQ.

SOS links were output as a list, rather than a string.

- Moving the HEAD request in utils/fix_links.py within the try-except block, so as to prevent the script from failing as soon as an invalid URL is found.