Get rid of C99 PRI?64 usage in source files

Amend to d5f1e72. It turns out that BerkelyDB was including inttypes.h
indirectly, so we cannot fix this with just macros.

Trivial commit: apply the following script to all .cpp and .h files:

1. Middle sed -i 's/"PRIx64"/x/g' "$1" sed -i 's/"PRIu64"/u/g' "$1" sed -i 's/"PRId64"/d/g' "$1"
2. Initial sed -i 's/PRIx64"/"x/g' "$1" sed -i 's/PRIu64"/"u/g' "$1" sed -i 's/PRId64"/"d/g' "$1"
3. Trailing sed -i 's/"PRIx64/x"/g' "$1" sed -i 's/"PRIu64/u"/g' "$1" sed -i 's/"PRId64/d"/g' "$1"

After this commit, git grep for PRI.64 should turn up nothing except
the defines in util.h.