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As in dynSeries/extract we consider a tensor product.

*Example*

Suppose that a dynSeries object contains the following set of variables

GDP_1
GDP_2
GDP_3
GDP_4
GDP_5
GDP_6
GDP_7
HICP_1
HICP_2
HICP_3
HICP_4
HICP_5
HICP_6
HICP_7
Consumption_1
Consumption_2
Consumption_3
Consumption_4
Consumption_5
Consumption_6
Consumption_7

Then the syntax:

b = a{'@GDP,HICP@_@1,2,3@'}

will instantiate a new dynSeries object containing variables:

GDP_1
GDP_2
GDP_3
HICP_1
HICP_2
HICP_3

updates in the particle filters routines

Closes #353

Closes #307

Fix issue about reduced form mapping with posterior samples + notation improvements

2) Improve the notation of info saved of  threshold reduced form mapping which was obscure.

Clarification of terminology of filtered variables

Closes #317

power of negative numbers

reporting: @graph: use green shading which is easier to see because 'FaceAlpha' doesn't work on octave (at least on os x)

parallel bug fix 

several bug fixes for cluster computations

1) properly manage hybrid matlab/octave computations;
2) check for function handles under octave, which cannot be saved on a mat file;
3) bug fix for non standard octave path;
4) synchronization fix under octave;
5) Retrieve missing output files when remote threads are finished;
6) check if input files have been updated, like in metropolis computations with load_mh_file=1;
7) check if output files are missing to trap synchronization failures: this may be inefficient and needs to be improved for unix/windows clusters;
8) fixed cleanup with multiple remote nodes.

2) removed return after failure of ping; some machines like hal can be connected but do not allow ping;