[option] new VNS strategy for neighborhood increase: ADD1 up to maxclustersize+nbclusters-1 followed by MULT2

Merge branch 'vns3' of git+ssh://scm.mulcyber.toulouse.inra.fr//var/lib/gforge/chroot/scmrepos/git/toulbar2/toulbar2 into vns3

[error] correct getneighborhood when connected components occur ; improve check of completeness in repair methods

Merge branch 'vns3' of git+ssh://scm.mulcyber.toulouse.inra.fr//var/lib/gforge/chroot/scmrepos/git/toulbar2/toulbar2 into vns3

[code] RADGVNS debug mode prints current search depth, neighborhood size, discrepancy limit (, and estimated remaining search space)

[code] RADGVNS will run until optimum proved or stop if maximum kmax reached and no restart asked for (see option -L)

[misc] modify random generator in order to be able to generate clauses (by changing tightness in rungenerate)

[error] bug correction when using clauses inside BTD (we need to take care of cost moves between clusters)