Implement configuration system.

Implement minimal Makefile.

Make compile-time-optional jemalloc features controllable via configure
options (debug, stats, tiny, mag, balance, dss).

Conditionally exclude most of the opt_* run-time options, based on configure
options (fill, xmalloc, sysv).

Implement optional --enable-dynamic-page-shift.

Implement optional --enable-lazy-lock.

Re-order malloc_init_hard() and use the malloc_initializer variable to support
recursive allocation in malloc_ncpus().

Add mag_rack_tsd in order to receive notifications of thread termination.

Add jemalloc.h.

.hgignore

@@ -0,0 +1,11 @@
+syntax: glob
+
+syntax: regexp
+^jemalloc/autom4te\.cache
+^jemalloc/cfg(hdrs|outputs)\.stamp$
+^jemalloc/config\.(log|status)$
+^jemalloc/configure$
+^jemalloc/lib$
+^jemalloc/Makefile$
+^jemalloc/src/jemalloc_defs\.h$
+^jemalloc/src/[a-z]+.o$