#9 long64 renamed; >4GB support for streams

[Hauke Duden]

This patch renames long64 to int64 and ulong64 to uint64.

It also changes the Stream interfaces and
implementations so that seek/getPosition etc. use 64
bit integers instead of 32 bit integers. This enables
support for streams >4GB.

And last but not least the patch fixes a mini issue in
the Dictionaries example. It seems that it somehow fell
through the cracks when kdmix replaced all longs with
ints. This is fixed by this patch.

My apologies for doing multiple things in one patch -
it was an organizational mistake on my part ;).

[Hauke Duden]

[kdmult]

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Applied.