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Using rule_list, build up rule_db which is a data structure which consists
of nested dicts that store BOTH the left and the right policies. All of the
keys are interned strings. The permissions are stored as a set. The basic
structure is rule_db[cond_exp][block_bool][src][tgt][tclass] = sides
where:
cond_exp is a boolean expression
block_bool is either true or false
src is the source type
tgt is the target type
tclass is the target class
sides is a named tuple with attributes "left" and "right" referring to the
left or right policy. Each attribute in the sides named tuple refers to a
named tuple with attributes "perms" and "orig_rule" which refer to a
permission set and the original unexpanded rule.
sides = ((left_perms, left_orig_rule),(right_perms, right_orig_rule))
There are a few advantages to this structure. First, it takes up way less
memory. Second, it allows redundant rules to be easily eliminated. And,
third, it makes it easy to create the added, removed, and modified rules.
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