Issue #3251835 by beatrizrodrigues, joachim, mikelutz, quietone: Fix incorrect @return docs and description for Row::getSource()

Issue #2579361 by quietone, ayushmishra206, heddn, jibran, Wim Leers, Lendude, benjifisher, dww: Row->setSourceProperty() docs are misleading

Issue #3160323 by ravi.shankar, John.nie, quietone, jungle: Add quotes around property name in exception message in Row.php

Issue #3023126 by spitzialist, minakshiPh, el7cosmos: Class Drupal\migrate\Row referenced with incorrect case: Drupal\Migrate\Row

Issue #2999906 by mikelutz, heddn, phenaproxima, alexpott: Move logic from the get plugin into the Row class

Issue #2941275 by zuhair_ak, joachim: improve the exception message for a missing source ID value in \Drupal\migrate\Row

Issue #2711353 by Jo Fitzgerald, rakesh.gectcr, quietone, chx, Yogesh Pawar, Pavan B S, biguzis, mikeryan, vasi, catch, iMiksu, dawehner, Berdir, benjy: Migrate never unsets existing data for content entitites

Revert "Issue #2711353 by rakesh.gectcr, Jo Fitzgerald, quietone, chx, Yogesh Pawar, Pavan B S, biguzis, phenaproxima, mikeryan, vasi, iMiksu, Berdir, dawehner, benjy: Migrate never unsets existing data for content entitites"

This reverts commit 3d524aaa.

Issue #2711353 by rakesh.gectcr, Jo Fitzgerald, quietone, chx, Yogesh Pawar, Pavan B S, biguzis, phenaproxima, mikeryan, vasi, iMiksu, Berdir, dawehner, benjy: Migrate never unsets existing data for content entitites

Issue #2698023 by Jo Fitzgerald, mitrpaka, mohit_aghera, gaurav.kapoor, heddn, edysmp, mikeryan: Get sourceid values sorted from Row

Issue #2776975 by joelpittet, dawehner, tim.plunkett, xjm, pfrenssen: March 3, 2017: Convert core to array syntax coding standards for Drupal 8.3.x RC phase

Issue #2719695 by alexpott, Mile23: Fix 'Drupal.Classes.ClassDeclaration.CloseBraceAfterBody' coding standard

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2590993 by mikeryan, webflo, svendecabooter, dixon_, phenaproxima: Create stub entities with proper default values

Issue #2606466 by mikeryan, Wim Leers, phenaproxima, quietone: Migration of uid 1 breaks batch upgrade process

Issue #2560637 by phenaproxima, benjy, quietone, mikeryan, chx, neclimdul: Improve handling of uid 1 during migration

Issue #2319375 by andrewmacpherson: Fixed Malformed @endcode tag in docblock for \Drupal\migrate\Row::getRawDestination().

Issue #2293773 by Gábor Hojtsy, alexpott, penyaskito: Fixed migrations use dots in key names - not allowed in config.

Issue #2213451 by andypost, bdone, benjy, penyaskito, chx, claudiu.cristea, damiankloip, gregboggs, InternetDevels, jessehs, jhedstrom, marvil07, mikeryan, pcambra, Xano, YesCT: Update Migrate API in core

Migrate in core #2125717 by mikeryan, chx, marvil07, bdone, jessehs, mpgeek, BTMash, fastangel, mongolito404, Moshe Weitzman, eliza411, YesCT, dawehner, cosmicdreams