checkStep: Private/inner/helper method to check the order of the invoked analysis methods
Description
This method should not be used by package users. It gets an rds object and a
required number of analysis step and, if possible, calls the requested method to reach
that step. It returns the object and a logical value that tells if the analysis can go on.
Usage
checkStep(rds, neededStep)
Arguments
rds
A RoarDataset object.
neededStep
The analysis step where rds should be/arrive.
Value
A list containing a logical that shows if the needed step could be reached
with rds and the object at the requested step. Check step won't repeat
a step already done and the logical value will be FALSE in this case (and rds
won't be returned modified).