tests: update in english, not run with vanilla
test RDDpred: minor modif
tests: remove useless plotBin check
model.matrix: add (possibly temp) argument forcex to have notation without the circonflexe
reg_np: use now model.matrix
tests: update input and output for new reg_np using model.matrix
reg_np: update doc
model.matrix: always return x, not 'x circ 1', adapt other funs
test: adapt in/output for using only x now
clusterInf: simplify fun
test: update for correction of clusterInf
NEW VERSION 0.21: update DESC and NEWS