FIX: Sort separator '.' was breaking deep fields, '~' instead

'~' is 1) Not reserved by http://tools.ietf.org/html/rfc3986 2) Not used in name OR name parts separator in any common programming language, so won't break deep fields or cause % in URL
FIX: Sort separator '.' was breaking deep fields, '~' instead

'~' is 1) Not reserved by http://tools.ietf.org/html/rfc3986 2) Not used in name OR name parts separator in any common programming language, so won't break deep fields or cause % in URL