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Avoid raw memory access for high precision types.

Janek Kozicki requested to merge fixRawMemoryAccess into master

Some of the high precision types cannot work correctly with raw memory access functions such as memset or memcpy. In fact most of the memset(…) calls can be replaced with std::fill(…) calls. This can be done later, because my current approach is to completely not modify current yade behavior for double type. So in all places the old code is still used when double type is used, even if it YADE_REAL_BIT is not defined - so this code works as intended even without merging !362 (merged).

Later we can remove some of the #if clauses and use the generic C++ approach which always is guaranteed to be optimized as much as memset or memcpy.

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