Commit Briefs
simplify wrap_page and fix wrapping of pre text
The column at which preformatted text should be formatted is the same as the "normal" text, so why the difference? MIN(fill_column, width) is always the correct choice for wrapping the text.
fill pre text until the last available column, not one less
This was fixed previously in the wrap_text case but I forgot to update the hardwrap_text case too.
replace TAILQ_EMPTY/INSERT_HEAD/TAIL dance with a single TAILQ_INSERT_TAIL
Now that all the queues are correctly initialised, there's no need for that dance.
move help to its own file
in order to do so, we also have to export some internal variables from ui (the width and height of the window). Not the best possible outcome, but are used only in recompute_help, and can be dropped later. Also, move wrap_page to wrap.c.