client: reorg/factoring for 'experimental' builds

- Dockerfiles: separation of concerns for build types
- Dockerfiles: pull from respective hledger-based branches/tags
- Dockerfiles: move hledger-based test building into experimental
- docker-finance.yaml: add commented package 'unuran' (experimental)

client/Dockerfiles/finance/archlinux/Dockerfile.hledger-flow.src.in

@@ -35,7 +35,6 @@ RUN git clone --depth=1 https://github.com/apauley/hledger-flow -b v0.15.0
 WORKDIR /usr/local/src/hledger-flow
 RUN stack setup
 RUN stack build
-RUN stack test --interleaved-output --pedantic
 RUN stack install --local-bin-path=/usr/local/bin
 
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