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

PHPBB3-10865
[ticket/10865] Should have been a slash.

PHPBB3-10865
[ticket/10865] Use code tags for install/database_update.php.

PHPBB3-10865
Merge PR #1052 branch 'p/ticket/10865' into develop-olympus

* p/ticket/10865:
  [ticket/10865] Use code tags for install/database_update.php.
  [ticket/10865] Should have been a slash.
  [ticket/10865] Add .css, .js, and .htaccess to the list of ASCII mode files
  [ticket/10865] Phrase change for visiting with browser
  [ticket/10865] Grammar corrections for the entire document
  [ticket/10865] Typo and phrasing change
  [ticket/10865] Updates and additions to /docs/INSTALL.html
[ticket/11186] Database unit tests fail on windows using sqlite2

The problem is, that we try to recreate the db and reconnect to it, while the
old connection is still hold. To resolve this, we just drop all tables and
recreate the tables instead of the hole db.

PHPBB3-11186
[ticket/11190] Functional tests purge cache before running.

Added functions to get and purge cache to functional framework also.

PHPBB3-11190
[ticket/10879] Remove arrow icon from attachment link in editor

If you upload a file with a long filename the filename will partially
cover the arrow icon background image. Remove the icon as it's not needed
anyways.

PHPBB3-10879
Merge remote-tracking branch 'marc1706/ticket/10879' into develop-olympus

* marc1706/ticket/10879:
  [ticket/10879] Remove arrow icon from attachment link in editor
[ticket/11202] Add a heuristic function to check for response success.

This tries to account for php sending fatal errors with 200 status code.

PHPBB3-11202
[ticket/11202] Check response success before content assertions.

This does not change tests that perform requests which are either
clearly not supposed to succeed or are a gray area.

PHPBB3-11202
[ticket/11202] Custom message does not make sense here, delete it.

PHPBB3-11202
Merge PR #1069 branch 'Fyorl/ticket/11190' into develop-olympus

* Fyorl/ticket/11190:
  [ticket/11190] Functional tests purge cache before running.
Merge remote-tracking branch 'p/ticket/11202-olympus' into develop-olympus

* p/ticket/11202-olympus:
  [ticket/11202] Custom message does not make sense here, delete it.
  [ticket/11202] Check response success before content assertions.
  [ticket/11202] Add a heuristic function to check for response success.
Merge PR #1060 branch 'nickvergessen/ticket/11186' into develop-olympus

* nickvergessen/ticket/11186:
  [ticket/11186] Database unit tests fail on windows using sqlite2