decoupleR update

Moved benchmark of methods to a separate repository: https://github.com/saezlab/decoupleRBench
Added repository for the manuscript: https://github.com/saezlab/decoupleR_manuscript
Added consensus score based on RobustRankAggreg after running decouple with multiple methods.
Added fgsea method.
Added AUCell method.
Added univariate decision tree udt method.
Added multivariate decision tree mdt method.
Added multivariate linear model mlm method.
Changed name of psicra to wsum.
Changed name of mean to wmean.
Changed name of scira to univariate linear model ulm.
Changed output format of all methods from tf to source.
Added error when network edges are duplicated.
Added error when the user leaves NAs or Infs in the input matrix.
Fixed order mismatch between statistics and their arguments in decouple.
Updated documentation and examples for all methods.
Added p-values to all methods based on permutations or statistical tests (fgsea, mlm, ora, ulm, viper, wmean and wsum).
Updated README and DESCRIPTION

saezlab / decoupleR