fragment-insertion sepp to display # of inserted features upon completion.

[mestaki]

It would be very useful if upon completion sepp would print out the # of successfully inserted features.

So far, working on human and mouse samples I've never had a case where any features failed to be inserted to the tree, but I still do the filtering step and each time my table is unchanged. The filtering step can also take a little time depending on the number of features you have. It would be super convenient if sepp can just take print how many features it inserted and the user could compare that number to their feature-table reads and see if a filtering step is needed or not.
Alternatively, the full insertion and filtering can be turned into a pipeline to do all in one go.

Thanks!