espeak/en: fix /@5/ -- should be /u:/, not /@/
tests/phonemeset.py: s/Base/Based/g
phonemesets: add tests for IPA, X-SAMPA and CXS to cover the transcriptions for English lexical sets
transcription-en.md: document the English vowel lexical sets
transcription-en.md: document the English consonants
transcription-en.md: document the English syllabic consonants
transcription-en.md: document syllable/stress transcriptions
transcription-en.md: support Scottish 'wh' consonant /W/
transcription-en.md: support English triphthong transcriptions
transcription-en.md: support the ROSES reduced vowel
transcription-en.md: support the LOT-CLOTH split
transcription-en.md: support the TRAP-BATH split
transcription-en.md: support the HORSE-HOARSE merger
transcription-en: split the NURSE lexical set into pre-merged FERN-FIR-FUR lexical sets
transcription-en: organize the references section
transcription-en: move the BATH vowel into the short vowels
transcription-en: sort the vowels according to the vowel chart
phonemesets: test IPA -> phonemeset for English phonemes
phonemesets: test IPA -> espeak/en for English phonemes
arpabet: umprove coverage