handoff autoconf silent-rules mode correctly to bundled libevent
 added a number of m4 macros from the gnu autoconf repo
 libevent now builds optionally, complete with fairly correct behavior when using 'make dist', 'make clean', and 'make dist clean'
 lots of memory mgmt debugging, discovered apr_os_thread_put() derefs non NULL pointers even though they are write-only
 enabled autoconf versioning and automake maintainer mode, added m4 goodness so now backwards compatible to at least autoconf 2.62
 added module for static memory pool management included thread-local pools with no requirement that state be passed in an arg
 added thread behavior randomization testing via an entropy source file