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Convert numbers from base 10 integers to base X strings and back again.
Sample usage::
>>> base20 = BaseConverter('0123456789abcdefghij')
>>> base20.encode(1234)
'31e'
>>> base20.decode('31e')
1234
>>> base20.encode(-1234)
'-31e'
>>> base20.decode('-31e')
-1234
>>> base11 = BaseConverter('0123456789-', sign='$')
>>> base11.encode('$1234')
'$-22'
>>> base11.decode('$-22')
'$1234'
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