code cleanup: remove unused phonemetable ph_yoruba

phsource/ph_yoruba

- 
-
-phoneme a
-  vwl starttype #a endtype #a
-  length 200
-  FMT(vowel/a_4)
-endphoneme
-
-phoneme e
-  vwl starttype #e endtype #e
-  length 200
-  FMT(vowel/e_mid2)
-endphoneme
-
-phoneme E
-  vwl starttype #e endtype #e
-  length 200
-  FMT(vowel/e_mid2)
-endphoneme
-
-phoneme i
-  vwl starttype #i endtype #i
-  length 190
-  IfNextVowelAppend(;)
-  FMT(vowel/i)
-endphoneme
-
-phoneme o
-  vwl starttype #o endtype #o
-  length 200
-  FMT(vowel/oo)
-endphoneme
-
-phoneme O
-  vwl starttype #o endtype #o
-  length 200
-  FMT(vowel/oo)
-endphoneme
-
-phoneme u
-  vwl starttype #u endtype #u
-  length 200
-  FMT(vowel/u_bck2)
-endphoneme
-
-
-phoneme i~
-  vwl starttype #i endtype #i
-  length 220
-  FMT(vnasal/i_n2)
-endphoneme
-
-phoneme E~
-  vwl starttype #e  endtype #e
-  length 220
-  FMT(vnasal/ee_n2)
-endphoneme
-
-phoneme O~
-  vwl starttype #o endtype #o
-  length 220
-  FMT(vnasal/oo_n2)
-endphoneme
-
-phoneme u~
-  vwl starttype #u endtype #u
-  length 220
-  FMT(vnasal/u_n)
-endphoneme
-
-