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			This commit introduces the OVNI_TRACEDIR environment variable to change the directory where traces are generated. By default, when the envar is not defined, the trace is still generated in the ovni directory. The envar can take a trace directory name, a relative path to the directory, or its absolute path. In the first case, the directory is created in the current path $PWD. Both libovni (rt) and ovnisync read this environment variable.