Convert the man page source from roff to DocBook, and generate html and
roff output. Modify the build system such that the documentation can be
built as part of the release process, so that users need not have
DocBook tools installed.
Add test/jemalloc_test.h.in, which is processed to include
jemalloc/jemalloc@install_suffix@.h, so that test programs can include
it without worrying about the install suffix.
Fix divide-by-zero error in pprof. It is possible for sample contexts
to currently have no associated objects, but the cumulative statistics
are still useful, depending on how the user invokes pprof. Since
jemalloc intentionally does not filter such contexts, take care not to
divide by 0 when re-scaling for v2 heap sampling.
Install pprof as part of 'make install'.
Update pprof documentation.
