'int' is enough for 'length' to migrate code from x86 to x64

[FrankLike via Digitalmars-d]

>> Many excellent projects such as dfl,dgui,tango, many 'length' 
>> which type is 'int' or 'uint',they are D's,many people like 
>> it.but they should migrate to 64 bit.So if 'length' type is 
>> 'int',they can work on 64 bit,but now,they must be modify for 
>> 'length''s type.
> broken code must be fixed by the authors of the broken code. 
> that code
> is broken. authors must fix it.

Now,dfl's anthor miller has stopped updating the dfl project,and 
dgui also was.But they are excellent,we like to use it.