Minor fixes to localxml and valuetrimmer#346

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Commits on Oct 16, 2015

Fix reading of localconf.
Björn Tantau
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Only trim values if column is present in item.
Björn Tantau
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Use own method to read Magento dir.
Björn Tantau
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Commits on Dec 17, 2015

Only delete empty values in specified store.
Björn Tantau
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