Handling column names directly: Part 2

[mechatroner]

RBQL can now handle a.good_alphanumeric_column_name and a["arbitrary column name!"] notation (see #6 ).
But it would be great to go further and support direct column variables like name, surname, price etc without a and b prefixes.
It is not clear yet if it is possible at all to handle raw column names reliably and transparently. The most obvious problem is a potential conflict between column names and Python/JS identifiers, e.g. columns named class, if, sys, function, etc.