[Developers] new attribute engine

[Helene Payraudeau]

Dear all,

I am now working on a whole new attribute engine which will, I hope, be 
more flexible and faster than the old one.

One of the most inportant changes : the calculation of the attributes is 
no longer made on traces but using a whole new object, the DataHolder. 
What is it? You may have seen the  new class ValueSeries 
(Basic/valseries.h-cc), the dataholder contains an ObjectSet< 
ValueSeries<float> > which holds the value of every sample of the Seistrc.
Advantage : in case of an attribute which has other attributes as 
inputs, data are available in the corresponding dataholders so it saves 
a lot of time ( easier and much faster to read some floats in a 
ValueSeries than to get values from a SeisTrc )
Stored data are still read from cubes of Seistrc and written the same way.
AND : the reference is no longer time but sample number.

To avoid reading same data several times the parsing of the attributes 
is now uncoupled from the processing ( attrib calculator has gone ).
The attrib executor has also disappeared, a lot of its job is done by 
the attrib provider ;  the attrib output class is, in that new version,  
only aware of its own existance,  no dependencies on  processor or 
provider.

Hopefully this will be part of a release before the EAGE. Of course each 
attribute has to be "translated" to fit with the new version. As soon as 
the new Engine is ready I will provide a notice so that you can figure 
out how new attributes have to be written in the future to be ok with 
the new Attribute Engine.

If you want further information, don't hesitate to contact me.

-- 
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