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

<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
	<name>platform_group</name>
	<comment></comment>
	<projects>
	</projects>
	<buildSpec>
		<buildCommand>
			<name>org.python.pydev.PyDevBuilder</name>
			<arguments>
			</arguments>
		</buildCommand>
		<buildCommand>
			<name>com.aptana.ide.core.unifiedBuilder</name>
			<arguments>
			</arguments>
		</buildCommand>
	</buildSpec>
	<natures>
		<nature>com.aptana.projects.webnature</nature>
		<nature>org.python.pydev.pythonNature</nature>
	</natures>
</projectDescription>