Comment change
WFA::getSomeWeight(): now possible to call w/o initial state
Prep for AWPDS: use WFA weights instead of PDS weights for WFA stuff

This is so that there can be different types of weights on the PDS and WFA.

This commit is a fixed version of what was originally a small part of commit 62bfe12 on what is now the defunct-branch-awpds (and then 2c9e757 on defunct-branch-awpds-rebase-and-fix) tag. The fix is f959d on the defunct-branch-awpds-rebase-and-fix branch.
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