Issue #1539940 by jwilson3, infiniteluke, mrf, ryanissamson: Fix up README files to encourage good placement of themes, modules, and profiles

Issue #562042 by cburschka, Rob Loach, sun, scor: Added Search for install profiles in sites/[all|site]/profiles folders, and move core profiles into /core/profiles.

Issue #1711070 by kid_icarus, tim.plunkett, xjm, droplet, zendoodles and cam8001: Convert tests to use ::$modules property instead of parent::setUp($modules).

Issue #950956 by tim.plunkett, aspilicious, jenlampton, chx, Rob Loach: Remove Dashboard module until/unless such time as it's more useful.

Issue #1592632 by tim.plunkett, sun, Berdir, Rob Loach, aspilicious: Merge List field types into Options module.

Issue #1496542 by cosmicdreams, sun, chx, vasi1186, aspilicious, alexpott, nadavoid, Pedro Lozano, disasm, andypost | heyrocker: Convert site information to config system.

Issue #1552412 by duellj: Make API links point to D8 version, and where possible make them future-proof

- Patch #1404198 by sun, beejeebus, fago, chx: Separate database cache clearing from static cache clearing and data structure rebuilding.

Issue #1361232 by sun, Berdir, aspilicious, fago, klausi, amateescu: Make the taxonomy entities classed objects.

Issue #1187550 by franz, boombatower, mlncn: .profile files do not have to be listed in profile .info files.

Issue #1373142 by sun, beejeebus, aspilicious, amateescu: Use the Testing profile. Speed up testbot by 50%.

- Patch #1454538 by effulgentsia, Gábor Hojtsy, kalman.hosszu: langcode property to all entity types; for the user entity, distinguish entity language from user's language preference.

Issue #911354 by adrian, boombatower, jhedstrom, sun, yhahn, dixon_, et al: Fixed Tests in profiles/[name]/modules cannot be run and cannot use a different profile for running tests.

This reverts commit 9db1fddb.

Issue #1164852 by plach: Default the 'translatable' bit on fields to FALSE for fields created in the UI, to match those created by the API.

- Patch #1048006 by jyyna, wojtha, David_Rothstein: name of vocabulary (Tags) created during install cannot be localized.

#915174 follow-up by David_Rothstein: More .module files that no longer need to be specified in files[].

#895140 follow-up by David_Rothstein: Tests to ensure older versions of modules are not chosen over new ones.

#511258 by Gábor Hojtsy, David_Rothstein, Bojhan, catch, et al: Fixed do not enable the management menu by default.

#438224 by dww, sun, netsensei, vordude, et al: 'Post comments without approval' permission name is completely misleading.

#881530 by yhahn: Fix exportability of vocabularies by using machine names in taxonomy field's 'allowed values' setting.

#882164 by aschiwi, Gábor Hojtsy, David_Rothstein, reglogge, et al: Fix the 'install from another language' instructions so that they actually work.