1/ --enable-man-page doesn't work

Missing doc/mallard2man.py

(and make install-man don't work if not build)

2/ too generic name

Various man pages have too generic name, and conflict with system man pages:

clock.3
endianness.3
index.3
json.3
memory.3
parsing.3
streaming-bson.3
utf8.3
creating.3
errors.3
installing.3
oid.3
performance.3
threading.3
version.3