Removed code was added back by my backups.
Replace "phpBB Group" with "phpBB Limited"

- In the previous PR, some words had forgotten to be replaced.
Update footer in qi_functions.php

- add https
- add 3.1 reférence
- be compliant with qi_main.php and overall_footer.html
Merge pull request #39 from phpbb-fr-com/master-pr_39

Forgot to update footer and some "phpBB Group" in in a previous PR
Issue #38 Subsilver2 was not installed for 3.1.x boards.
Now all available styles can be installed (currently only for 3.1.x).
Merge branch 'master' into quickinstall-intl-fr
Now all available styles can be installed. In both 3.0.x and 3.1.x.
Any style can be set as default style.
Moved some stuff to Misc settings.
Use the same string timezones as phpBB 3.1.x. To still be compatible with both 3.0.x and 3.1.x.
Automagically update settings. With link to update all profiles (only for 1.2.1 and up).
Merge branch 'master' into quickinstall-intl-fr
Fix footer displaying in "qi_functions.php"
Fix hardcoded language key when "gen_error_msg()" is called
Added a documentation tab, with info currently from readme.txt.
Show all tabs except "main" when installing QI.
Merge pull request #40 from phpbb-fr-com/master-pr_40

Fix footer displaying in "qi_functions.php" when "gen_error_msg()" is called
Merge pull request #41 from phpbb-fr-com/master-pr_41

Fix hardcoded language key when "gen_error_msg()" is called
Moved template var S_page to their respective file.
Changed some wordings and removed unused strings from language files.
The "boards" tab was not hidden when there where errors in submitting first/only config.
QI tried to write to the "settings" folder even if it was not writable.