equo: add "equo upgrade" option (alias for equo world)

docs/man/equo.pod

@@ -136,7 +136,7 @@ print description too (w/--quiet)
 
 upgrade your distribution to a new release (branch)
 
-=item B<world>
+=item B<world (or upgrade)>
 
 update system with the latest available packages
 

docs/man/man1/equo.1

@@ -129,7 +129,7 @@
 .\" ========================================================================
 .\"
 .IX Title "EQUO 1"
-.TH EQUO 1 "2009-05-15" "perl v5.8.8" "Entropy"
+.TH EQUO 1 "2009-05-16" "perl v5.8.8" "Entropy"
 .SH "NAME"
 \&\fBequo\fR \- Official Sabayon Linux Package Manager Client
 .SH "SYNOPSIS"
@@ -237,8 +237,8 @@ print description too (w/\-\-quiet)
 .IP "\fBhop <branch\fR>" 4
 .IX Item "hop <branch>"
 upgrade your distribution to a new release (branch)
-.IP "\fBworld\fR" 4
-.IX Item "world"
+.IP "\fBworld (or upgrade)\fR" 4
+.IX Item "world (or upgrade)"
 update system with the latest available packages
 .RS 4
 .IP "\fB\-\-ask (\-a)\fR" 4