[TASK] Document that TYPO3 is not compatible with MySQL strict mode

Document that in the requirements section of the INSTALL.md.

Resolves: #54883
Releases: 6.2
Change-Id: Idd80528493b9920f4488e359f13fe4304ac5fe25
Reviewed-on: https://review.typo3.org/26725
Reviewed-by: Wouter Wolters
Reviewed-by: Philipp Gampe
Reviewed-by: Aske Ertmann
Reviewed-by: Oliver Klee
Reviewed-by: Stefan Neufeind
Reviewed-by: Michael Stucki
Tested-by: Michael Stucki
Reviewed-by: Markus Klein
Tested-by: Markus Klein

INSTALL.md

@@ -30,9 +30,20 @@ system requirements for running TYPO3 CMS 6.2 LTS are:
 
 * Webserver capable of running PHP applications (Apache, Nginx, IIS or other)
 * PHP >5.3.7 up to 5.5 (PHP 5.4 or later recommended)
-* MySQL 5.1 up to 5.6 or compatible
+* MySQL 5.1 up to 5.6 or compatible (no "strict mode", see below)
 * more than 200 MB of disk space
 
+### MySQL environment
+
+TYPO3 works with MySQL in the above mentioned versions. It will also work on
+compatible "drop-in" replacements like MariaDB or Percona.
+
+Note that MySQL "strict mode" is currently not supported by TYPO3. If your
+MySQL server is configured with either STRICT_TRANS_TABLES or
+STRICT_ALL_TABLES (especially true with MySQL 5.6, as this is a new default),
+you need to configure setDBinit in the Install Tool. See question 2 in the
+"Installation FAQ" below for more information.
+
 ### PHP environment
 
 * memory_limit set to at least 64M
@@ -78,7 +89,7 @@ functionality:
 
 * Apache with mod_expires and mod_rewrite enabled
 
-* MySQL 5.1 or newer
+* MySQL 5.5 or newer
 
 * GraphicsMagick or ImageMagick v6 or newer installed on the server
 
@@ -256,7 +267,7 @@ A:  If you use MySQL 5.x or newer, try setting it to "compatible" mode. Open the
     example.com is the web site domain), navigate to "All configuration".
     Find "setDBinit", and add this line to the top of the input field:
 ```
-	SET SESSION sql_mode='MYSQL40'
+	SET SESSION sql_mode=''
 ```
 
 ### 3