Use initlog() in more tests.

Use initlog() in more tests.

These required a small amount of manual tidying-up but the script I used to
generate most of the changes is

#!/usr/bin/env python3

import sys

lines = list()
skip_next_if_blank = False
with open(sys.argv[1], 'r') as handle:
    for line in handle:
        if line != 'std::ofstream logfile("output");\n':
            if "deallog.attach" not in line:
                if skip_next_if_blank and line == "\n":
                    pass
                else:
                    lines.append(line.replace("logfile",
                                              "deallog.get_file_stream()"))
                    skip_next_if_blank = False
        else:
            skip_next_if_blank = True

found_main = False
line_after_main = -1
with open(sys.argv[1], 'w') as handle:
    for line in lines:
        handle.write(line)
        if line.startswith("main("):
            found_main = True
        if found_main:
            line_after_main = line_after_main + 1
        if line_after_main == 1:
            handle.write("  initlog();\n")