[ticket/10854] sql server drop default constraint when dropping column

drops default columns with T-SQL before attempting drop column to
avoids sql exception.  This is a huge annoyance in UMIL scripts running
under sql server.
[ticket/10865] Updates and additions to /docs/INSTALL.html

Added anti-spam section.
Changed www.mydomain.com/tld to www.example.com.
Updated update section to mention third party styles.
Reworded several sentences for clarity.
Made file name/path formatting more consistent.
Corrected update archive type availabilities.
Changed PHP version listing to be less redundant.

PHPBB3-10865
PHPBB3-10918
[ticket/10865] Typo and phrasing change

PHPBB3-10865
[ticket/10949] Converted AJAX coding standards to new guidelines.

Basically, moved parentheses to same line and changed variable names to
camel case.

PHPBB3-10949
[ticket/10865] Grammar corrections for the entire document

Fixed more grammatical issues, changed some phrasings, added a link
for offline conversions, and other corrections.

PHPBB3-10865
[ticket/10865] Phrase change for visiting with browser

PHPBB3-10865
[ticket/10970] Paths of the form {FOO}/a/{BAR}/b parsed correctly

A new method to handle this type of path was added and
compile_tag_include, compile_tag_include_php and
compile_tag_include_js were modified to use it appropriately.

Tests were added for these three macros also.

PHPBB3-10970
[ticket/10970] Added support for forms such as {FOO}bar.{EXT}

PHPBB3-10970
[ticket/11015] Make DBAL classes autoloadable

PHPBB3-11015

This allows us to just create the object without having to include the
driver first. However, it also means that users must specify the full
class name in config.php
[ticket/11015] Add BC files for the drivers

PHPBB3-11015
Merge branch 'develop' into ticket/11015

* develop:
  [ticket/11012] Fix php_ext change in mock_extension_manager
  [ticket/11012] Normalize $phpEx member vars to $php_ext
  [ticket/11002] Use translating option to rename the Etc/GMT options

Conflicts:
	phpBB/includes/extension/manager.php
[ticket/11015] Correctly set sql_layer in driver base class

PHPBB3-11015
[ticket/11015] Fix connection manager db driver selection

PHPBB3-11015
[ticket/11015] Fix db connection type hint in lock_db

PHPBB3-11015
[ticket/11015] Fix configuration for travis

PHPBB3-11015
[ticket/10970] Added missing initialisations and modified the regex

Non-existent variables now become empty strings.

PHPBB3-10970
[ticket/10970] Fixed a problem with prepending root paths

PHPBB3-10970
[ticket/10865] Add .css, .js, and .htaccess to the list of ASCII mode files

PHPBB3-10865
[ticket/10970] Removed unused $vars

PHPBB3-10970
[ticket/10939] Added $_FILES handling to phpbb_request

PHPBB3-10939