Improve the comments in the default config file

WendzelNNTPd-OSE/wendzelnntpd.conf

@@ -1,21 +1,28 @@
-; wendzelnntpd.conf
-
+; WendzelNNTPd default configuration file
+;
+; Please note:
+;     By default, SQlite instead of MySQL is used; no
+;     authentication is activated and standard ports are used.
+;     Also, the server listens only on the localhost interface
+;     ("listen 127.0.0.1").
+
+;;;;;;; Fundamental setup ;;;;;;;
 ; Specify a database engine. Currently supported are 'sqlite3'
 ; and 'mysql'.
 database-engine sqlite3
 
-; Your database hostname (not required for sqlite3)
+;;;;;;; MySQL-specific parameters ;;;;;;;
+; Your database hostname (not used in case of sqlite3).
 database-server 127.0.0.1
-
-; The database connection port (not required for sqlite3).
-; Comment out to use the default port of your database engine
+; The database connection port (not used in case of sqlite3).
+; Comment out to use the default port of your database engine.
 database-port 3306
-
 ; Server authentication (not required for sqlite3)
 database-username myuser
 database-password mypass
 
-; You have to specify the port _before_ using the 'listen' command!
+;;;;;;; Network settings ;;;;;;;
+; You need to specify the port _before_ using the 'listen' command!
 ; However, a mix like `port xyz, listen abc, port bca, listen zyb'
 ; should work fine, i.e. assigning different ports to different
 ; network interfaces.
@@ -27,24 +34,25 @@ listen	127.0.0.1
 
 ; Uncomment 'verbose-mode' if you want to find errors or if you
 ; have problems with the logging subsystem. All log strings are
-; written to stderr, too, if verbose-mode is set. Additionaly all
-; commands sent by clients are written to stderr (but not to the
-; logfile).
+; written to STDERR, too, if verbose-mode is activated.
+; Additionaly all commands sent by clients are written to STDERR
+; (but not to the logfile).
 ;verbose-mode
 
+;;;;;;; Advanced settings ;;;;;;;
 ; The max. allowed size of a single posting (in bytes). The
-; default value is 20 MBytes (20971520 Bytes)
+; default value is 20 MBytes (20*1024^2=20.971.520 Bytes).
 ;max-size-of-postings 20971520
 
-; Activate authentication
+; Activate authentication.
 ;use-authentication
 
-; If you activated authentication (above), you can also activate
+; If you activated authentication (above, using the keyword
+; `use-authentication'), you can also activate the support for
 ; access control lists (ACL).
 ;use-acl
 
-; This prevents that IPs or hostnames will become part of the
-; message ID generated by WendzelNNTPd (what is the default case).
-; Uncomment `enable-anonym-mids' to enable this feature.
+; This keyword prevents that IPs or hostnames will become part of
+; the message ID generated by WendzelNNTPd (what is the default
+; case). Uncomment `enable-anonym-mids' to enable this feature.
 ;enable-anonym-mids
-