Bug fixes.
Added the possibility to set the number of points in mode_check for computing the transversal cuts.
Added online auxiliary filter as options_.mode_compute=10.
Fixed datafile (data_risky_perturb3 is not versioned).
Partially reverted commit 06237375dbcf7fedc5275e4779fc87c45c73936d.
Removed useless line.
Fixed seed in non linear filters.
Fixed typo.
Added new routine.
Rewrote ispd routine more efficiently using cholesky decomposition.
Factorized code using ispd routine.
Factorized code using ispd routine and fixed bugs in models with measurement errors.
Merge branch 'master' into particles-bug-fixes
Added an option for setting the number of points where the posterior kernel is evaluated when using mode_check. Reorganized the options_ global structure wrt mode_check.
Fixed bug.