[Swan-dev] lib/libswan/goodmask.3.xml is obsolete

[D. Hugh Redelmeier]

This describes three functions that no longer exist:
goodmask, masktobits, and bitstomask.

- we should delete it and the things that reference it
	lib/libswan/ipsec_bitstomask.3
	lib/libswan/ipsec_masktobits.3


- we should document any replacement function

I think Andrew made the changes to the actual code so he is probably in 
the best position to update the documentation.