Merge Karnov Group's excel-to-code with upstream excel_to_code#21

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andreasDalsgaard wants to merge 13 commits intotamc:masterfrom

andreasDalsgaard:merge-karnov-with-head

Commits on Jan 15, 2019

Workaround for solving unbounded recursion when hlookup a value in
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Fix most errors from named references being replaced by blanks in the
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Make the rewrite of shared formulae aware of named references
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Fix that avoid indirect references to be resolved as blanks and thereby be replaced with zeros
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Fix for hlookup with strings
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Extend recursion prevention such that sheets does not need to be
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Disabling of optimization in debug mode
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Return 0 for cells that have been optimized away
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Fixes to make changes pass rspec tests
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Add support for resetting individual sheets
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Merge remote-tracking branch 'origin/master' into merge-karnov-with-head
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Cleanup for publishing code
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Use c worksheet name to make test case pass
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