Cleanup patch 2 - knownMerge & noRefrag

[Patch date 2003-06-30 10:40]

This patch is based on cleanup.1c.

Merged from SF-VQB (29a[SF-VQB]-v0.33):

known files list duplicate merge feature (Tag: "SLUGFILLER: mergeKnown"). Known files list entries are merged when duplicates are encountered.

packet refragment removal (Tag: "SLUGFILLER: noRefrag"). Packets are no longer refragmented in send if they're over 1300 bytes in size, nor are they refragmented in UploadClient if they're over 2600 bytes in size.