vi: modify length for vowels

phsource/ph_vietnam

   	IF thisPh(isFirstVowel) AND thisPh(isFinalVowel) AND thisPh(isWordEnd) THEN
 	length 240
 	ELSE
-	length 140
+	length 180
 	ENDIF
 	IF nextPh(N) OR nextPh(c) THEN
 	FMT(vnasal/a_n)
   ELIF nextPh(N) THEN
   length 200
   ELSE
-  length 140 //200
+  length 180 //200
   ENDIF
     FMT(vowel/a_8)
 endphoneme
   IF thisPh(isFirstVowel) AND thisPh(isFinalVowel) AND thisPh(isWordEnd) THEN
 	length 240
 	ELSE
-	length 140
+	length 180
 	ENDIF
   FMT(vowel/e_e)   //ee_3)
 endphoneme
   IF thisPh(isFirstVowel) AND thisPh(isFinalVowel) AND thisPh(isWordEnd) THEN
 	length 240
 	ELSE
-	length 140
+	length 180
 	ENDIF
   FMT(vowel/e)
 endphoneme
   length 100
   FMT(vnasal/ii_n)
   ELSE
-  length 140
+  length 180
 FMT(vowel/i_4)
 ENDIF
 endphoneme
 	ELIF thisPh(isFirstVowel) AND thisPh(isFinalVowel) AND thisPh(isWordEnd) THEN
 	length 240
 	ELSE
-	length 140
+	length 180
 	ENDIF
     FMT(vdiph2/o_oo) //vowel/oo)
 endphoneme
 	ELIF thisPh(isFirstVowel) AND thisPh(isFinalVowel) AND thisPh(isWordEnd) THEN
 	length 240
 	ELSE
-	length 140
+	length 180
 	ENDIF
     FMT(vowel/o) //vowel/oo)
 endphoneme
 	ELIF thisPh(isFirstVowel) AND thisPh(isFinalVowel) AND thisPh(isWordEnd) THEN
 	length 240
 	ELSE
-	length 140
+	length 180
 	ENDIF
   FMT(vowel/o)  // o_2)
 endphoneme
 	ELIF thisPh(isFirstVowel) AND thisPh(isFinalVowel) AND thisPh(isWordEnd) THEN
 	length 240
 	ELSE
-	length 140
+	length 180
 	ENDIF
   FMT(vnasal/u_n,60) //vowel/u_5)
 endphoneme
 	ELIF thisPh(isFirstVowel) AND thisPh(isFinalVowel) AND thisPh(isWordEnd) THEN
 	length 240
 	ELSE
-	length 140
+	length 180
 	ENDIF
   FMT(vowel/u#_5)
 endphoneme
 	ELIF thisPh(isFirstVowel) AND thisPh(isFinalVowel) AND thisPh(isWordEnd) THEN
 	length 240
 	ELSE
-	length 140
+	length 180
 	ENDIF
   FMT(vowel/V)   //vowel/@_2)
 endphoneme
   IF thisPh(isFirstVowel) AND thisPh(isFinalVowel) AND thisPh(isWordEnd) THEN
 	length 240
 	ELSE
-	length 140
+	length 180
 	ENDIF
   FMT(vowel/@_2)
 endphoneme
   IF thisPh(isFirstVowel) AND thisPh(isFinalVowel) AND thisPh(isWordEnd) THEN
 	length 240
 	ELSE
-	length 140
+	length 180
 	ENDIF
   FMT(vnasal/oi_n)
 endphoneme
   IF thisPh(isFirstVowel) AND thisPh(isFinalVowel) AND thisPh(isWordEnd) THEN
 	length 240
 	ELSE
-	length 140
+	length 180
 	ENDIF
   FMT(vdiph/@i_3)
 endphoneme
   IF thisPh(isFirstVowel) AND thisPh(isFinalVowel) AND thisPh(isWordEnd) THEN
 	length 240
 	ELSE
-	length 140
+	length 180
 	ENDIF
   FMT(vowel/u_3,70)
 endphoneme