hush: move towards more correct variable expansion

hush: fix a few cases in FOR v IN ... construct
      unfortunately, code growth is big - ~600 bytes

shell/hush_test/hush-vars/var_subst_in_for.right

@@ -0,0 +1,40 @@
+Testing: in x y z
+.x.
+.y.
+.z.
+Testing: in u $empty v
+.u.
+.v.
+Testing: in u " $empty" v
+.u.
+. .
+.v.
+Testing: in u $empty $empty$a v
+.u.
+.a.
+.v.
+Testing: in $a_b
+.a.
+.b.
+Testing: in $*
+.abc.
+.d.
+.e.
+Testing: in $@
+.abc.
+.d.
+.e.
+Testing: in -$*-
+.-abc.
+.d.
+.e-.
+Testing: in -$@-
+.-abc.
+.d.
+.e-.
+Testing: in $a_b -$a_b-
+.a.
+.b.
+.-a.
+.b-.
+Finished

shell/hush_test/hush-vars/var_subst_in_for.tests

@@ -0,0 +1,40 @@
+if test $# = 0; then
+    exec "$THIS_SH" var_subst_in_for.tests abc "d e"
+fi
+
+echo 'Testing: in x y z'
+for a in x y z; do echo ".$a."; done
+
+echo 'Testing: in u $empty v'
+empty=''
+for a in u $empty v; do echo ".$a."; done
+
+echo 'Testing: in u " $empty" v'
+empty=''
+for a in u " $empty" v; do echo ".$a."; done
+
+echo 'Testing: in u $empty $empty$a v'
+a='a'
+for a in u $empty $empty$a v; do echo ".$a."; done
+
+echo 'Testing: in $a_b'
+a_b='a b'
+for a in $a_b; do echo ".$a."; done
+
+echo 'Testing: in $*'
+for a in $*; do echo ".$a."; done
+
+echo 'Testing: in $@'
+for a in $@; do echo ".$a."; done
+
+echo 'Testing: in -$*-'
+for a in -$*-; do echo ".$a."; done
+
+echo 'Testing: in -$@-'
+for a in -$@-; do echo ".$a."; done
+
+echo 'Testing: in $a_b -$a_b-'
+a_b='a b'
+for a in $a_b -$a_b-; do echo ".$a."; done
+
+echo Finished