fix overflow in blame callback

spotted by noticing gotwebd crashing on some blame requests.

Diff from stsp@ with a fix from tracey@, I'm committing it only because
he is short on time.

ok stsp@

gotwebd: initialize IPv4 and IPv6 sockets in the same way

ok tracey

gotwebd: don't listen on FCGI sockets when FCGI is not enabled

ok tracey

gotwebd: do not allocate server/socket list heads separately

ok millert@

gotwebd: do not allocate address list heads separately, this is unnecessary

ok millert@

fix snprintf error handling

follow the "proper secure idiom" described in the CAVEATS section of
printf(3). reminded by tb@ and millert@

convert two snprintf to strlcpy

"looks good to me" millert@

check for fprintf failure

got(1): Replace 'Ar sign' with 'Cm sign'

Cm sign matches the markup used in the ssh-keygen(1) man page.

Patch by Josiah Frentsos

regress: adjust expected usage output in "revert_no_arguments" test

Group options in accordance with style(9)

patch by Josiah Frentsos

gotwebd: fix double free in gotweb_process_request

don't free the querystring, it's already done later by
fcgi_celanup_request.

ok tracey@

tog: add missing checks for NULL pointers in log view state

ok jamsek

tog: don't block when processing log view 'G' key map

As per stsp's TODO item, make tog respond to key presses while "loading..."
history. Initial testing in src.git appears to work as intended.

ok stsp@

tog: fix delayed tree index update

If a child blame view has been opened, halfdelay() is reset to a 1 second
refresh rate, so the index in the header lags behind subtree navigation as we
set the index based on the selected tree entry, which isn't updated till that
refresh cycle completes. Don't wait for the selected_entry to update; instead,
compute the index from the first displayed entry and the currently selected
line index.

improved by and ok stsp@