clean the memory of newly created node

When the node is allocated from the system pool, it's memset to zero,
but not if it's allocated from one of the memory pools
fix the type VAL_ALL_BIT for 64-bit systems
Rearrange the struct memebers

Such that they are better aligned with their natural memory boundary.

The order is: long long, pointer, long, int, short, char
Clear unused field in object values

Or the body field will be garbage, and cause recycling a module! to
crash.
rearrange struct members
Revert "Fix a crash on 64-bit systems"

This reverts commit 85d5cc32a034daae7f2f1daacb5233981b936799.
correct Reb_Word for 32-bit systems