xbps-src: follow target names from xbps utils.

Some targets have been renamed:
	info		-> show
	list-files	-> show-files
Added a new target to print reverse dependencies for a package:
	show-revdeps

xbps-src/xbps-src.sh.in

@@ -95,9 +95,6 @@ Targets:
  fetch [pkgname]
   Download package source distribution file(s).
 
- info [pkgname]
-  Show information for the specified package.
-
  install [pkgname]
   Installs a package into destination directory and \`stows' its files into
   <masterdir>. If a package is not from bootstrap group, its files will be
@@ -106,10 +103,6 @@ Targets:
  list
   List installed packages in <masterdir>.
 
- list-files <pkgname>
-  List package files from <pkgname>. Package must be fully installed
-  into <masterdir> for this to work.
-
  make-repoidx
   Build a package index for the local repository associated with the
   master directory <masterdir>. By default set to <masterdir/host/binpkgs.
@@ -118,9 +111,20 @@ Targets:
  remove [pkgname]
   Remove package completely from <destdir> and <masterdir>.
 
+ show [pkgname]
+  Show information for the specified package.
+
+ show-files <pkgname>
+  Show package files from <pkgname>. Package must be fully installed
+  into <masterdir> for this to work (stowed).
+
+ show-revdeps <pkgname>
+  Show reverse dependencies for <pkgname>, i.e packages that are currently
+  depending on <pkgname>.
+
  stow [pkgname]
   Stow <pkgname> files from <destdir> into <masterdir> and register package
-  in database. When a package is \`stown', its files will be available in
+  in database. When a package is \`stowed', its files will be available in
   <masterdir>, and other packages will be able to found it.
 
  unstow [pkgname]
@@ -429,7 +433,7 @@ clean)
 	setup_tmpl ${_pkgname}
 	remove_tmpl_wrksrc $wrksrc
 	;;
-extract|fetch|info)
+extract|fetch)
 	if [ -z "${_pkgname}" ]; then
 		[ ! -r ./template ] && msg_error "missing build template in $(pwd).\n"
 		_pkgname=$(basename_cwd)
@@ -458,9 +462,6 @@ install)
 list)
 	$XBPS_BIN_CMD list
 	;;
-list-files)
-	list_pkg_files ${_pkgname}
-	;;
 make-repoidx)
 	if [ -n "${_PACKAGEDIR}" ]; then
 		export XBPS_PACKAGESDIR=${_PACKAGEDIR}
@@ -481,6 +482,20 @@ remove)
 		remove_pkg
 	fi
 	;;
+show)
+	if [ -z "${_pkgname}" ]; then
+		[ ! -r ./template ] && msg_error "missing build template in $(pwd).\n"
+		_pkgname=$(basename_cwd)
+	fi
+	setup_tmpl ${_pkgname}
+	info_tmpl
+	;;
+show-files)
+	list_pkg_files ${_pkgname}
+	;;
+show-revdeps)
+	show_pkg_revdeps ${_pkgname}
+	;;
 stow)
 	stow_flag=yes
 	if [ -z "${_pkgname}" ]; then