At open, if a file is created, a new store_fname has to be generated. At close, the size of the file has to be updated at all write modes. bzr revid: p_christ@hol.gr-20100713205324-q6g2tvem2qem6ftg
To be done: ----------- * Test to not create several times the same file / directory -> May be put a sql_constraints uniq on several files -> test through remove or put * Retest everything