Rearrange / rewrite large portions of fetch() to take advantage of new

libfetch features (fetchRestartCalls, fetchXGet()).

Since it doesn't make much sense to have m_flag and r_flag set at the same
time, and it can actually cause trouble in some cases, die if they're both
set.

Set the SA_RESETHAND flag for SIGINT so that when we've caught one, we can
kill ourselves with a second SIGINT (thus notifying our parent of our tragic
fate) instead of just exiting.

These changes fix several problems that would show up when fetching ports,
as well as speeding up HTTP transfers quite a bit (at least for relatively
small files).

Most of these changes were prompted by an interaction problem with an HTTP
server called SWS-1.0, which exhibited two bugs, the first of which prevented
fetch from working around the second (the first was not sending content-type
in reply to HEAD requests, the second was sending garbage after the end of
the requested file).

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