Add Quenya ⟨iu⟩, ⟨ui⟩ diphthongs

Both are copied from the Finnish phonemes, since Finnish was a major
inspiration for Quenya. This means that the ⟨iu⟩ diphthong is a
“falling” one – according to Appendix E of The Lord of the Rings, this
is the original pronunciation, but by the Third Age (the time in which
The Lord of the Rings is set) it had become a “rising” one, so I may
change the phoneme later, not sure.

Makefile.am

@@ -412,6 +412,7 @@ phsource/phonemes.stamp: \
 	phsource/ph_punjabi \
 	phsource/ph_pyash \
 	phsource/ph_quechua \
+	phsource/ph_quenya \
 	phsource/ph_romanian \
 	phsource/ph_russian \
 	phsource/ph_russian_lv \

dictsource/qya_rules

@@ -64,7 +64,7 @@
 
 .group i
 	i	i
-	// TODO iu (no suitable diphthong in ph_latin)
+	iu (+	iu
 	// light penultimate syllable: put stress on antepenultimate
 	i (AX	=i
 	i (CAX	=i
@@ -131,7 +131,7 @@
 
 .group u
 	u	u
-	// TODO ui (no suitable diphthong in ph_latin)
+	ui (+	ui
 	// light penultimate syllable: put stress on antepenultimate
 	u (AX	=u
 	u (CAX	=u

phsource/ph_quenya

@@ -0,0 +1,13 @@
+phoneme ui
+  vwl starttype #u endtype #i
+  length 270
+  lng
+  FMT(vdiph/ui_4)
+endphoneme
+
+phoneme iu
+  vwl starttype #i endtype #u
+  length 280
+  lng
+  FMT(vdiph2/iu_2)
+endphoneme

phsource/phonemes

@@ -1921,8 +1921,9 @@ phonemetable py eo
 include ph_pyash
 
 phonemetable qya la
+include ph_quenya
 
-phonemetable sjn qya
+phonemetable sjn la
 
 phonemetable es-la es
 include ph_spanish_la