modifications to have relative src for media in the xml ldt of a project. - Migration in order to set all the project ldt with the new values in the xml. If the media has a content that doesn't exist, the media is erased. If the project has no valid media, the project is deleted. There is a test in project_tests. - The migration uses the command : set_projectldtiri - The command set_projectldtiri uses the function in utils relative_src_xml that returns an xml. The command deletes the projects that have no ldt or the ldt isn't valid (empty string) - Modifications in lignesdetemps to have absolute urls in the xml when we open a project or in the research when we display the results in lignes de temps

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ALTER TABLE ldt_utils_media

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   ADD COLUMN mimetype_field character varying(512);