Cnode improvements and fixes#8

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rinpatch wants to merge 10 commits intoOverbryd:masterfrom

rinpatch:cnode-improvements-and-fixes

Commits on Oct 23, 2019

Cnode improvements and fixes
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Commits on Oct 24, 2019

Cnode: Make null pointer check for the comment string shorter and fix
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Cnode: Do not omit the left part of ?: because -Wpedantic complains
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Cnode: Move result assignment out of tag atom check because it's the
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Cnode: Use a VLA tag namespace
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Cnode: Shorten next node picking
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Cnode: use sizeof() for snprintf() buffer limit
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Cnode: replace strpcpy with strncpy
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Cnode: use strncpy for copying tag name to the tag string
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Cnode: use strncpy for concatenating hostnames
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