TDB historical performance (with pretty graphs)

[Rusty Russell]

Hi all,

    I've been doing some measurements on tdb performance, mainly to see if all 
the additions since the old code (eg. transactions, hasnfn) have caused 
noticeable slowdown.  Was a bit of a pain to compile all the versions (git 
didn't seem to figure out all those source moves), and so some are missing, but 
I was interested in trends.

Executive summary:
   There's no significant slowdown trend, but some changes have made real 
performance differences.  But there's still room for improvement: we seem to 
suck recently on the "replace 5000 4byte key 4 byte date records with 8 byte 
dataa records" but I can't immediately see why: 1024-byte key/4 byte data 
records are better than ever.

So enjoy the prettiness!
Rusty.
PS. Tests were run on a 64-bit x86 system; values are total usecs.
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