add -t and other new options

Make functionality closer to that in Linux. Add tree (-t) option. Add
version (-V) option. Add nonstandard parentheses (-p) option to take
advantage of Mac listing of manufacturer name. Fix some broken logic.
Send help output to stderr instead of stdout. Avoid use of temp file.
Revert "add -t and other new options"

This reverts commit b0ce7bcd37c8af768aef78304e76df17b31d0ffb.
modularizing and adding root hubs

Add root hubs to output. Modularize parsing routine for later addition
of tree function. Use its return value to decide whether to use output.
Add version (-V) option. Require colon for device (-d) function. Add
nonstandard parenthesis (-p) option to take advantage of Mac OS X
parsing. Send help output to stderr instead of stdout. Use arithmetic
comparison instead of string for bus and device. Avoid use of temp
file.
add tree function

Make functionality closer to that in Linux. Add tree (-t) option.
improved man page

fleshing out man page (previously moved to section 8)
Changed: formatting, version output
Make compatible with bash; general cleanup

Now works with either sh or bash shell. Lots of quote marks and
prettier comments. Changed man page and -V option to avoid confusion.
Resolving conflicts
remove line-ending blanks

cleanup