Modified the proto_register_field_array usage again. Thanks to Guy's

Modified the proto_register_field_array usage again. Thanks to Guy's
suggestion, this new method using a static array should use less memory
and be faster. It also has a nice side-effect of making the source-code
more readble, IMHO.

Changed the print routines to look for protocol proto_data instead of
looking at the text label as they did before, hoping that the data hex
dump field item starts with "Data (".

Added the -G keyword to ethereal to make it dump a glossary of display
filter keywords to stdout and exit. This data is then formatted with
the doc/dfilter2pod perl program to pod format, which is combined
with doc/ethereal.pod.template to create doc/ethereal.pod, from which
the ethereal manpage is created. This way we can keep the manpage up-to-date
with a list of fields that can be filtered on.

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@364 f5534014-38df-0310-8fa8-9805f1628bb7