Bug 45355

html output generation in ab is a second class citizen. It misses a lot of data, which is output in the text format, and some of the data written out is wrong.

Since the cleanup changes a lot of lines, I provide a series of 8 patches. Each subset 1...n produces a working ab.

The patches are:

- ab.c-whitespace-1.patch: Remove trailing whitespace

- ab.c-units-2.patch: Fix units in HTML output,
  also make placement of scaling factor consistent

- ab.c-proc_wait-3.patch: Add missing wait time in non-confidence output,
  fix processing time in text output, make write errors output conditional
  like for the other errors

- ab.c-missing_html_output-4.patch: Add missing html output part 1
  (ssl_info, err_recv, epipe, mean, wait time)
  and use CONF_FMT_STRING like in the text output case
- ab.c-html_sigs-5.patch: Handle signals in combination with html output
  like in the text case

- ab.c-html_gnuplot_csv-6.patch: Allow gnuplot and csv in combination
  with html output (use common function)

- ab.c-share_statistics-7.patch: Refactor statistics generation to 
  use a shared function for html and text output

- ab.c-html_conf_perc-8.patch: Add confidence and percentile output
  to html output