#75 overwriting files at wave file import from default directory

[remi pianese]

When a sound file is imported into Wired, if the
original file is located in the Wired projects default
directory, it is overwritten by its own convertion.
This subsenquently cause the lost of the original file
and Wired to loop constantly.

[Louis Carrese]

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We should make things clear about how the audio working directory is handled.
Things are to be discussed but it should be somewhere in the session directory, its path saved with the session (so we have everything stored in one place, and we know where it is...).

Will be solved with the merge of the save center.