Feature: Extend membership if existing level present#16

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aquiferweb wants to merge 2 commits intostrangerstudios:masterfrom aquiferweb:extend_membership

+148-10

Commits on Oct 26, 2018

fixes strangerstudios#13 - adds new function pmprosed_pmpro_ipnhandler to allow access to $user_id when processing IPNs from Paypal (no change in current functionality, but allows future modificati…
aquiferweb
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Attempts to extend an existing membership level (if present) rather than always basing the calculation on the current time
aquiferweb
committed