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/findatender/findatender_test.go

@@ -79,7 +79,8 @@ func opportunityIDs(ops []*types.Opportunity) []string {
 }
 
 func TestFetchOncePublic(t *testing.T) {
-	ft, _ := pagedServer(t,
+	ft, _ := pagedServer(
+		t,
 		[]string{releaseJSON("ocds-1", "1"), releaseJSON("ocds-1", "2"), releaseJSON("ocds-2", "1")},
 		[]string{releaseJSON("ocds-3", "1")},
 	)
@@ -98,7 +99,8 @@ func TestFetchOncePublic(t *testing.T) {
 }
 
 func TestFetchAllPublic(t *testing.T) {
-	ft, _ := pagedServer(t,
+	ft, _ := pagedServer(
+		t,
 		[]string{releaseJSON("ocds-1", "1"), releaseJSON("ocds-2", "1")},
 		[]string{releaseJSON("ocds-1", "2"), releaseJSON("ocds-3", "1")},
 	)