Also fixes:
- Issue #2555297 by morbiD: IPN's always have pid's of 0 in database

NOTE: This will delete all entries in {paypal_payment_ipn} with pid=0 (perhaps
all of them). If you still need those although they are not linked to
any particular payment you should make a backup of this table before
running the update.

{paypal_payment_ipn} is changed to store one transaction ID per payment
status item (instead of per payment). This allows multiple transaction IDs
to be stored for every payment.

Also fixes:
- Issue #2215527 _dcre_, Xano: paypal changes API endpoints and now HTTP 1.1 is
  needed

drupal_http_request() is not able to handle HTTP 1.1 (see #2242123). chr
provides a CURL drop-in replacement for drupal_http_request() so this is
an easy fix.

This adds a dependency on chr. The module must be downloaded to the
drupal site before running this update.

Issue #2147173 by Xano | ExTexan: Missing "t" in translate function calls - paypal_payment_pps.module.

Issue #2055665 by mvdve: PayPal error: The link you have used to enter the PayPal system contains an incorrectly formatted item amount.