Sometimes when I am using “Remove Doubles” I need to increase the value of the Limit over 1.000. How I can increase this value? In which file of Blender Code it is set the maximum value of the limit to 1.000?
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Just work araound it.
before you remove the doubles you could scale the whole thing down until it works,
and than scale it up again.
but be careful with this method. Blender only saves vertice data to a precision of 0.000001. If you scale down you risk that the vertices aren’t at the same position anymore after you scalled up again. Probably the vertices won’t be move around very much but in some cases you might see the loose of quality
Actually, I’d rather say, when you need a limit that high, you can’t really call them doubles anymore. That means either that your mesh is really too “big” according to Blender units, as suggested, or you need some other method to remove these vertices.
that’s right. They wouldn’t even be doubles if they are very very close to each other but not exactly on the same position. A little earlier I was confused that the “limit” function does exist. So it’s more a general question. Either we should remove the “limit” function or we should remove the limit of the “limit” function 
For distances that big, you should use the “Merge” function.
Select your vertices, then press Alt-M (or W -> Merge) and choose your preferred method of merging…
ideally, yes. however, numerical instablility can cause tiny fluctuations in exact position, so eventually, verts that you want to be perfectly in the same position, may in fact be off by an imperceptible amount. this is why the remdoubles function takes a small threshold, to account for numerical instability.
also, its already been beaten to death, but remdoubles with a limit of 1.0 is merging vertices that are 1 entire BU (blender unit) apart, so it would be hard to consider them doubles unless you were on the scale of thousands of blender units, which would likely be unnecessary.
as has been mentioned, if you just want to merge vertices you can use the actual merge tool.