HPCC-9799 Status

checkpoint before restructuring call to TokenData::createSyntaxTree to only
accept tokens

Signed-off-by: jamienoss <james.noss@lexisnexis.com>
HPCC-9799 Status

Removed left and right child nodes. Restructured bison types. removed
transferchildren and added TokenData::clear and 'add' to handles addition of
new nodes in tree from .y

Signed-off-by: jamienoss <james.noss@lexisnexis.com>