NOTES FOR ADDING JIT TO IPFW

First of all, an isolation of the actions executed per-rule is needed. That
way, writing the IR will be much easier:

	- Have taken the actions executer for all case and put them in inlined
	  functions, we used the last case name of the switch at ipfw_chk().

	- When this functions did something weird with the control flow of the
	  system using macros, I untangled them. See rule_tcpopts.

	- There's yet to see what happens with the auxiliary functions of ip_fw2.c,
	  since they may not be used again from that file. (They have been put at
	  the rules file).