This fixes problems where printing floating point numbers less than
10^-6 output as "0.0". Such numbers now use using scientific notation
and preserve the value's actual floating point representation.
Added tests for the conditional operator, operator precedence,
modules ("module" and "export" keywords, and the "::" operator), and
for the "copy" keyword.
Also improved tests of max/min values of int, count, and double constants.
Added tests of all built-in Bro data types (including different
representations of constant values, and max./min. values), keywords, and
operators (including special properties of certain operators, such as
short-circuit evaluation and associativity).
