Big cleanup in config help and description

Redundant help texts (one which only repeats the description)
are deleted.

Descriptions and help texts are trimmed.

Some config options are moved, even across menus.

No config option _names_ are changed.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

Config.in

@@ -22,7 +22,7 @@ config DESKTOP
 
 	  If you are preparing your build to be used on an embedded box
 	  where you have tighter control over the entire set of userspace
-	  tools, you can unselect this option for smaller code size. 
+	  tools, you can unselect this option for smaller code size.
 
 config EXTRA_COMPAT
 	bool "Provide compatible behavior for rare corner cases (bigger code)"
@@ -50,6 +50,26 @@ config USE_PORTABLE_CODE
 	  compiler other than gcc.
 	  If you do use gcc, this option may needlessly increase code size.
 
+#fixme: delete, create suboptions for applets which use this
+config FEATURE_AUTOWIDTH
+	bool "Calculate terminal & column widths"
+	default y
+	help
+	  This option allows utilities such as 'ls', 'telnet' etc
+	  to determine the width of the screen, which can allow them to
+	  display additional text or avoid wrapping text onto the next line.
+	  If you leave this disabled, your utilities will be especially
+	  primitive and will be unable to determine the current screen width.
+
+#fixme: delete, create suboptions for applets which use this
+config FEATURE_USE_TERMIOS
+	bool "Use termios for one-stroke input"
+	default y
+	help
+	  This option allows utilities such as 'top' to accept keyboard
+	  commands. Without this option, they simply refresh display
+	  after a fixed period.
+
 config SHOW_USAGE
 	bool "Show applet usage messages"
 	default y
@@ -113,14 +133,14 @@ config INSTALL_NO_USR
 	  never to /usr/bin or /usr/sbin.
 
 config PAM
-	bool "Support for PAM (Pluggable Authentication Modules)"
+	bool "Support PAM (Pluggable Authentication Modules)"
 	default n
 	help
 	  Use PAM in some busybox applets (currently login and httpd) instead
 	  of direct access to password database.
 
 config LONG_OPTS
-	bool "Support for --long-options"
+	bool "Support --long-options"
 	default y
 	help
 	  Enable this if you want busybox applets to use the gnu --long-option
@@ -187,7 +207,7 @@ config PID_FILE_PATH
 	  specify a pidfile path.
 
 config FEATURE_SUID
-	bool "Support for SUID/SGID handling"
+	bool "Support SUID/SGID handling"
 	default y
 	help
 	  With this option you can install the busybox binary belonging
@@ -611,6 +631,8 @@ config DEBUG_SANITIZE
 	  catch bad memory accesses (e.g. buffer overflows), but will make
 	  the executable larger and slow down runtime a bit.
 
+	  This adds -fsanitize=foo options to gcc command line.
+
 	  If you aren't developing/testing busybox, say N here.
 
 config UNIT_TEST
@@ -625,7 +647,7 @@ config WERROR
 	bool "Abort compilation on any warning"
 	default n
 	help
-	  Selecting this will add -Werror to gcc command line.
+	  This adds -Werror to gcc command line.
 
 	  Most people should answer N.