Fix: First After and Last After are Identical to First and Last In Between

[tnightengale]

Currently, the First After and Last After relationships are identical to the First In Between and Last In Between relationships.

This needs to be fixed and the distinction more clearly defined. To my understanding: First/Last After

• The appended activity should be added to each row of the primary activity as long as it occurred before/after the primary activity
• The same First/Last activity may be appended to multiple rows of the primary activity. Eg. All Ever 'visit page' appended with the First After 'bought something' activity, will have the same 'bought something' activity appended multiple times, if there exists n>1 'visit page' activities before the 'bought something' activity

First/Last In Between

• Will only append an activity that occurs first/last after the primary activity, if it occurs before the next primary activity