- add support for recursive transfers (but not for floppies), e.g.

- add support for recursive transfers (but not for floppies), e.g.
'mget -cr 4.*' would recursively fetch (-r), and resume the previous
transfers (-c) of 4.X release directories
uses local matching (fnmatch), but only for recursive transfers.
current behavior is not changed in any way.
- while here, ifndef SMALL debugging stuff, this saves some space,
for floppies
- some debugging code was enabled for non-debugging mode, checks
assume debug is set to zero, but it's not initially set
- all "Confirm with" prompts are forced, remove redundant argument
- fix usage: -C and -c are not available for SMALL

discussed a year ago w/ pyr@
looks good to millert@
previous version looked good to pyr@
man page tweaks & ok jmc@