RFC: Protocol fields list (reduce memory usage)

[Jakub Zawadzki <darkjames-ws () darkjames pl>]

Hi,

Right nowe for every protocol we have linked list with protocols fields. This list in total takes about 1.5 MB 
(more than 100K hf fields, 16 bytes on 64bits per GList).

This list is only used by two functions: proto_get_first_protocol_field() and proto_get_next_protocol_field(), which 
are used only by gtk:
 - autocompletion
 - supported protocols list (Internals menu)
 - tree model for filter expression dialog

hf fields are commonly registered next to each other. We can reduce memory usage 
if we replace SList iter per hf, with some range structure storing first hf and last one.

Attaching working PoC, listing all fields ordered by protocol takes some more time
(1.07s vs 0.04s compiled with -O0), but output is the same.

I'd appreciate any comments / review / testing.

Cheers,
Jakub.

Attachment: fields-list-to-range.patch
Description:

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