hide some debugging code behind a DPRINTF

fix -MMD test runtest first tries *without* the given extra-cflags, so -MMD was never added. singletest, instead, always use the args

update README

style tweaks

wrap preformatted in a figure and provide a caption too (if any)

template: drop the tp_body field

template: some printf -> puts conversions

template: allow '|' in some contexts

template: add template.1, template.7 will follow it's internal documentation only, not meant to be distributed.

template: fix possible use-after-free and drop the `render' sugar if some of the tp_* function fails, the inner code could free the template too (that's what galileo does), so `tp->tp_ret' would access free'd memory! Instead, add a local variable `tp_ret' to keep track of the return code. While here, drop the `render' shortand that adds the argument call, the template_reset function and adapt the regress.

template: preserve \

use template_free

template: add a template_free function

template: add regress for printf

template: add `printf' support