#110981 by saxofaan: allow contrib modules in install profiles and runtime to have requirements, just like core modules; also fix a consistency between message presentation in install and runtime requirements

#201717 by catch: remove the utf8 update helper which is the remaining of the removed 4.6 to 4.7 updates

#194310 by chx, catch, KarenS: run updates for disabled but previously installed modules, if they are compatible with the current system

#194010 by chx: Proper recursive dependency checking and ordering module installation in dependency order, so later installed modules can use previously installed module functionality

 - possible timeouts with installing/enabling lots of modules at once in core
 - enable install profiles to have more modules without fear of timeouts on install
 - bootstrap Drupal before each module load, so previously enabled modules are bootstrapped
 - let modules run their hook_requirements() (although actually calling them will be possibly fixed in another patch)

#141727 by merlinofchaos, dvessel, sun: restore themeability support for maintenance pages (regression)

#190283 by myself and JirkaRbyka: use get_t() in pre-database setup code, add missing javascript key to language objects (kills notices) and document st() better

#112064 by Dave Cohen and pwolanin: do not cache installer redirects, so live Drupal pages will be visible instead of cached installer pages

#166593 by hswong3i: move literal values out of some core queries to support cross-database compatibility (ie. better SQL parsing and altering options)

#150554 suggested by kkaefer, patch by me: rename 'po' folders to the more user friendly 'translations' name

as a side effect, improve usability of the module screen by performing module
changes all at once

- Patch #99011 by merlinofchaos: remove sites/default/settings.php and ship with sites/default/default.settings.php.

- Patch #76522 by RobRoy: avoid name clash between modules and install profiles.  Removing redundant hook.

- Patch #101829 by douggreen, ChrisKennedy and Grugnog2: drupal_install_fix_file() fails to calculate correct permissions.

- Patch #88287 by asimmonds, dww et al: installer doesn't support modules outside root/modules directory.  Critical bugfix.