Issue #779482 by mikeytown2, sun, dalin, cam8001, segi, alexpott, Boobaa, Sweetchuck, jbrown, quicksketch: Installation failure when opcode cache is enabled

Issue #863594 by David_Rothstein, smussbach, mbrett5062: Fixed Strange first paragraph in the installer database error message.

Issue #1980072 by  David_Rothstein: Fix inaccurate text in documentation for drupal_uninstall_modules

Issue #1727430 by tedbow, webchick, fubhy | amontero: Added 'exclusive' flag to install profiles to auto-select them during installation.

Issue #951644 by catch, David_Rothstein, aschiwi, xjm: Fixed Requirement warnings (e.g. for PHP memory limit) are not shown on install or update unless there is a requirement error also.

Issue #1295502 by pillarsdotnet: Fixed Add missing '$' character to docblock for timer_start(), timer_read(), and timer_stop() functions.

- Patch #1029606 by fago, bojanz, Damien Tournoud: hook_menu() should not be called during uninstallation.

- Patch #1014130 by catch, carlos8f, David_Rothstein: install_profile_info() does a file system scan on every request to admin/config (and etc.).

#346494 by hswong3i, Pancho, Dave Reid, duellj, dalin: Fixed DB drivers need to be able to change the configure database form during install

#151452 by David_Rothstein, Dave Reid, tstoeckler: Fixed uninstalling modules does not follow dependencies.

- Patch #944198 by sun: functions that call drupal_system_listing() act on potentially invalid system items.

- Patch #946968 by dmitrig01: we are not checking the version of MySQL and PostgreSQL servers anymore (nor we do for SQLite).

- Patch #323477 by justinrandell, boombatower, tstoeckler, Damien Tournoud: increase simpletest speed by running on a simplified profile.

#853748 by Stevel, andypost: Fixed Folders in includes/database that do not contain an (installable) driver are used anyway.

- Patch #641008 by reglogge, David_Rothstein, tstoeckler, marcvangend: duplicated text in install error message.

#293223 follow-up by David_Rothstein: Roll back 'Hide required core modules'. This was removing useful information to both new and experienced site builders, as well as hiding critical 'help' links.

#654726 by bdurbin, sun, plach, et al: Fixed Installing Drupal 7 in non-English language doesn't pick up st() installation lists.