Naming, layout and comments: descriptive full-word names, one item per line in wrapped calls and literals, and doc comments on exported names

Short and single-letter names in application code become full words (tests
keep theirs). Wrapped calls, signatures and composite literals put one item
per line, and one-line function bodies are expanded. Exported names and
groups of constants get doc comments, and comments refer to the renamed
identifiers.

internal/version/version.go

@@ -1,8 +1,11 @@
 package version
 
-// Version information (set at build time with -ldflags)
+// Version information (set at build time with -ldflags).
 var (
-	Version   = "dev"
+	// Version is the release version, or "dev" for a local build.
+	Version = "dev"
+	// BuildTime is when the binary was built.
 	BuildTime = "unknown"
+	// GitCommit is the commit the binary was built from.
 	GitCommit = "unknown"
 )