proto: fix broken trace RPC

* replace optional arguments by explicitly labeled ones
* re-insert missing argument to step in interp
56 jobs for igarnier@fix_trace_rpc in 20 minutes and 34 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Build
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build

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  Test
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documentation:build

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integration:inject.sh

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integration:multinode.sh

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integration:proto:sandbox

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integration:proto_demo_noops

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integration:rpc

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integration:sandboxes:voting

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unit:crypto

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unit:micheline

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unit:p2p:ipv6set

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unit:p2p:pool

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unit:p2p:socket

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unit:proto_alpha:lib_client

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unit:proto_alpha:lib_protocol

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unit:shell

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unit:stdlib

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unit:stdlib_unix

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unit:storage

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unit:validation

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failed #297888036
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documentation:linkcheck

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documentation:linkcheck

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integration:basic

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integration:cors

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Name Stage Failure
failed
documentation:linkcheck Test

(line 190) ok https://github.com/obsidiansystems/ledger-app-tezos#proposals-and-voting
(line 19) ok https://medium.com/tezos/amending-tezos-b77949d97e1e

build finished with problems.
make[1]: *** [Makefile:15: linkcheck] Error 1
make[1]: Leaving directory '/builds/nomadic-labs/tezos/docs'
make: *** [Makefile:82: doc-html-and-linkcheck] Error 2
ERROR: Job failed: exit code 1