SOCKS dissector, general cleanup.

SOCKS dissector, general cleanup.

Cleanup included:
1. converting proto_tree_add_text to proto_tree_add_item.
2. Converting state machines to use frame data instead of a large hash structure.
3. Apply consistent whitespace, add modelines
4. Remove global variable used for recursion, replaced with frame data.
5. Update protocol spec links
6. Add some "manual" fragmentation support. The goal was to fix bug 2157, but it appears some TCP SEQ/ACK inconsistencies may be getting in the way.

svn path=/trunk/; revision=48874