Make trie insensitive to apostrophes
When running Spell-checker.ipynb
I get:
----> 4 lang = c.cotrie(filename='/usr/share/dict/words').determinize().strip()
RuntimeError: expected ', got: aujourd'hui
because the French dictionary contains
...
augustes
aujourd'
aujourd'hui
aumône
...
The problem can be shrunk down to:
vcsn.B.trie('''
a'
b'c
''')