Merge pull request #2265 from tobiasd/20160119-docs

small additions to the docs, part of #2194

doc/Settings.md

@@ -24,6 +24,9 @@ You are not required to provide the year.
 System settings
 ---
 
+**Settings should be done in the admin panel** (/admin).
+Those settings found in the database, will always override the settings added to the ``.htconfig.php`` file.
+
 ###Language
 
 Please see util/README for information on creating language translations.
@@ -219,6 +222,8 @@ LOGGER_DEBUG will show a good deal of information about system activity but will
 You may also select LOGGER_ALL but due to the volume of information we recommend only enabling this when you are tracking down a specific problem.
 Other log levels are possible but are not being used at the present time. 
 
+Please be aware that turning on the logging can fill up the disk space on your server relatively quick.
+You should take preventions with e.g. [logrotate](https://en.wikipedia.org/wiki/Log_rotation) or similar tools.
 
 ###PHP error logging
 
@@ -238,3 +243,5 @@ Please report to the developers any errors you encounter in the logs using the r
 They generally indicate issues which need to be resolved. 
 
 If you encounter a blank (white) page when using the application, view the PHP logs - as this almost always indicates an error has occurred.
+
+*Note*: PHP logging cannot be activated from the admin panel but has to be configured from the ``.htconfig.php`` file.