growtree2: Tree growth based on PIs
In ningshi/ATEN: ATEN

A helper function for running tree-growth while each leaf is a prime implicant

growtree2(
  tree,
  pis,
  maxK,
  currentnodes,
  allnodes,
  penalty = FALSE,
  fast = TRUE
)

`tree`	an And/Or tree
`pis`	A list of prime implicants; Each prime implicant is a leaf
`maxK`	The size of the tree, or the maximum number of input genes; By defalt, maxK=8
`currentnodes`	The number of prime implicants that used for inferring a tree
`allnodes`	The number of genes in the Boolean network
`penalty`	TRUE or FALSE used to control the size of the tree
`fast`	A argument used to indicate whether a sort is needed