Update bitcoin v0.14.3

[marsu-dev]

this PR depend on #10

This PR update liquide 3.14.2 to 3.14.3 based on bitcoin v0.14.3

git commandes:

• git checkout -b rebase_liquid_3.14.3 rebase_liquid_3.14.2
• git rebase v0.14.3 --preserve-merge
• git checkout -b update_bitcoin_v0.14.3 update_bitcoin_v0.14.2
• git merge --strategy-option theirs --squash rebase_liquid_3.14.3

make check passed

[instagibbs]

Sorry for not getting back to this, we had been discussing our own strategy to keeping up with Core on future branch versions.

I'm not sure I'm a fan of squashing the commits. It's helpful to me to do diagnostics of what commits are where in the history. Would you consider a non-squashed version?

[marsu-dev]

Sure,
I have keept the rebased branches locally:

• reb/liquid_3.14.3
• reb/liquid_3.14.3

The essential conflict was on configure.ac and src/clientversion.h
I tried to keep the version coherent with the corresponding version from the upstream.

You will found two fixes for unit test

• #b516e6a -> #4f3f876
• #29181ad -> #dfab197

These commit should be a fixup for the corresponding commit, but I keep them apart.

For the locale string I also did two separate commit