Allow '<expr>.<field>' as an alternative syntax for '#<field> <expr>'

[julianhyde]

Allow '.' as an alternative syntax for '# '. Thus rather than writing '#emps scott' you could write 'scott.emps'.

This syntax is familiar for users of languages such as C, Java, SQL.

Because '.' and function application are both left-associative, it is easier to compose calls. You can write 'emp.address.zipcode' without parentheses, whereas the equivalent in function-oriented syntax would require parentheses, '#zipcode (#address emp)'.

[julianhyde]

Fixed in 268d123.