Merge pull request #4 from damienchimits/master

TcGSA.formula OK still a few glitch in plot1GS with NAs...
plot1GS fixed: precluster option added
Merge pull request #6 from borishejblum/damienissues

v0.9.9: patient heterogenity is now implemented
Merge pull request #2 from borishejblum/master

plot1GS fixed