svn path=/main/trunk/; revision=5369
Cleans the system by removing packages that will not affect the
functionality of the system. The arguments can be \fIebuilds\fR,
\fIsets\fR, or \fIdependencies\fR. For example, \fBemerge
-clean binutils\fR cleans out old versions of binutils;
+--clean binutils\fR cleans out old versions of binutils;
\fBemerge \-\-clean net\-www/mozilla\-0.9.9\-r2\fR cleans out that
specific version of Mozilla. This is generally safe to use.
\fBNote that\fR \-\-clean \fBdoes not remove unslotted packages.\fR