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buildgraph

alignment is now considered as a possible seed.

index format (see #28).

Create a new getOutput function for the new outpout format (all the
files corresponding to an assembling are stored in a single directory)

an old format index to the new one:

		- make the new directory  
		- move the files inside

directory named XXX.odx where XXX is the index name.
In this directory the index is simply called `index`

Signed-off-by: Eric Coissac <eric.coissac@metabarcoding.org>

Removed iupac from the file formats

Set a WARNING as some of the paremeters ar in fact never used as the function is called only in the unfold command.