Helping MSVC v16 compilation
Fix issue #554, wrong percentage in etterlog
Revert "Fix issue #554, wrong percentage in etterlog"

This reverts commit 918f9225adf3fc5c90b6a231ab0a426df0fe28d5.
tot_size cannot ever be equal to 0 because of it initialization:
tot_size = sizeof(struct log_global_header);
long long unsigned int should be uint64_t, to make every arch happy with PRIu64
Simplify el_display.c, getting rid of useless "write"
Merge pull request #555 from LocutusOfBorg/fix-pri64

Fix pri64 and etterlog