Replace the value of pnode's variable.
None = pnreplaceval(aPnode, varName, valString);
aPnode - type: pnode
varName - type: str
valString - type: str
None = pnreplaceval(aPnode, varName, valInteger);
aPnode - type: pnode
varName - type: str
valInteger - type: int
None = pnreplaceval(aPnode, varName, valPnode);
aPnode - type: pnode
varName - type: str
valPnode - type: pnode
None = pnreplaceval(aPnode, varName, valCon);
aPnode - type: pnode
varName - type: str
valCon - type: con
None = pnreplaceval(aPnode, varName, valPhrase);
aPnode - type: pnode
varName - type: str
valPhrase - type: phrase
None = pnreplaceval(aPnode, varName, valAttribute);
aPnode - type: pnode
varName - type: str
valAttribute - type: attr
None = pnreplaceval(aPnode, varName, valValue);
aPnode - type: pnode
varName - type: str
valValue - type: val