prefer error in databroker when multiple algorithms declare the same output & remove some error messages

the error containing "does not produce any data" should not be at this place, should it? unless you want to "force" people to only put real producers into the m_producers rather than a full list of algorithms. And if so, it should not say "IGNORING...", since it actually sets algEntry->dependsOn
also removed the unused algorithm warning since the counting is not yet implemented, and it annoys people currently ^^

@graven FYI

@olupton FYI put the error() instead of warning() for duplicated outputlocations

@sponce FYI: you might want to cherry-pick this and try whether this works out well..

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• a5b8c169 - throw exception when not finding inputs

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@leggett @clemenci unWIP as you like

unmarked as a Work In Progress

• [2018-11-10 00:03] Validation started with lhcb-lcg-dev3#707
• [2018-11-10 00:04] Validation started with lhcb-lcg-dev4#711
• [2018-11-10 00:06] Validation started with lhcb-tdr-test#356
• [2018-11-10 00:07] Validation started with lhcb-dd4hep#55
• [2018-11-10 00:15] Validation started with lhcb-gaudi-head#2056
• [2018-11-10 00:15] Validation started with lhcb-sanitizers#60
• [2018-11-11 00:09] Validation started with lhcb-sanitizers#61
• [2018-11-11 00:09] Validation started with lhcb-dd4hep#56
• [2018-11-11 00:09] Validation started with lhcb-gaudi-head#2057
• [2018-11-11 00:09] Validation started with lhcb-lcg-dev3#708
• [2018-11-11 00:10] Validation started with lhcb-tdr-test#357
• [2018-11-11 00:11] Validation started with lhcb-lcg-dev4#712
• [2018-11-12 00:04] Validation started with lhcb-lcg-dev4#713
• [2018-11-12 00:05] Validation started with lhcb-dd4hep#57
• [2018-11-12 00:06] Validation started with lhcb-lcg-dev3#709
• [2018-11-12 00:06] Validation started with lhcb-gaudi-head#2058
• [2018-11-12 00:09] Validation started with lhcb-sanitizers#62
• [2018-11-12 00:10] Validation started with lhcb-tdr-test#358
• [2018-11-12 08:55] Validation started with lhcb-gaudi-head#2058
• [2018-11-12 08:55] Validation started with lhcb-lcg-dev4#713
• [2018-11-12 08:55] Validation started with lhcb-lcg-dev3#709
• [2018-11-13 00:03] Validation started with lhcb-gaudi-head#2059
• [2018-11-13 00:03] Validation started with lhcb-sanitizers#63
• [2018-11-13 00:04] Validation started with lhcb-lcg-dev4#714
• [2018-11-13 00:04] Validation started with lhcb-lcg-dev3#710
• [2018-11-13 00:04] Validation started with lhcb-dd4hep#58
• [2018-11-13 00:07] Validation started with lhcb-tdr-test#359
• [2018-11-14 00:05] Validation started with lhcb-lcg-dev4#715
• [2018-11-14 00:08] Validation started with lhcb-dd4hep#59
• [2018-11-14 00:09] Validation started with lhcb-gaudi-head#2060
• [2018-11-14 00:11] Validation started with lhcb-sanitizers#64
• [2018-11-14 00:12] Validation started with lhcb-lcg-dev3#711
• [2018-11-14 00:17] Validation started with lhcb-tdr-test#360

mentioned in merge request !801 (merged)

changed milestone to %v30r5

assigned to @leggett

@nnolte, can you have a look to the discussions?

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• e150f784 - removed comments

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@clemenci done

resolved all discussions

approved this merge request

@nnolte : could not squash during the merge. do you want to rebase -i, or leave it as is?

added 28 commits

• e150f784...e1031fb8 - 27 commits from branch gaudi:master
• 531802eb - removed some useless error messages

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@leggett rebased, waiting for the pipeline to go through

approved this merge request