[ENH] Large file upload patch (remake)

> Hi folks!
>
>  Ok, this came up once again on IRC - how to do chunkwise uploading and
>  thus continously write to a file and handle LARGE files.
>
>  I googled and first I found Colin Curtin writing code for this (and also
>  streamed downloading code) back in 2004! Might be worth looking at more
>  closely. I also found Colin Putney's code from aug 2007, which seems to
>  originate from DabbleDB (I guess) - Squeak 3.7.
>
>  I more or less took Colin's approach, rewrote the low level bit (so that
>  it does not end up doing bytewise searching as I presume Colin's code
>  does) and more or less copied WATempFile as is. The multipartFormFieldsDo:
>  code now ALWAYS uses WATempFile, regardless if it has a file name or not -
>  and regardless of how small they are. This could of course be discussed.
>
>  But the MAIN THING is this:
>
>  Upload of 295Mb file (locally) on a box with tinyBenchmarks ('117972350
>  bytecodes/sec; 4788828 sends/sec') took around 45 seconds. Uploading
>  squeak.image which was 16Mb took 2 seconds or so. CPU load kinda high
>  (profile shows that it is the copying from the buffer into FileStream) but
>  no visible memory consumption.
>
>  I also noted that this is being recently discussed too - but hey, I had
>  already started coding and wanted to finish it :).
>
>  regards, Göran
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