Add Clustered proxying support to mod_serf, by using the heartbeats system.

No preconfiguration of cluster members is needed.

Just a config like this:
    SerfCluster sweet heartbeat file=/var/cache/apache/hb.dat
    SerfCluster sour heartbeat file=/var/cache/apache/cluster2.dat
    <Location "/">
      SerfPass cluster://sweet
    </Location>
    <Location "/different_cluster">
      SerfPass cluster://sour
    </Location>

The location of all possible destination servers is provided by a new 
providers interface, that includes configuration checking of the arguments to 
the SerfCluster command, solving one of the worst problems with the mod_proxy 
load balancer subsystem.


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  (hm_update_stats): Flush heartbeat file before closing, to make sure the file
    is always written correctly, and check for errors on flush or close.


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This is embarassing.


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Yank the few bits that implement the concept of an experimental MPM.


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LynxOS, QNX, and UnixWare


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Note: Prior to the MPM-as-DSO churn, the following MPMs did not enable this logic:

  WinNT       APR supports no-oping the setsockopt() based on inheriting Nagle from the 
              listening socket on this platform, so the new APR call will be a no-op.
  simple      same as WinNT for at least some Unix-y platforms
  BeOS        shrug



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  restore expected accept mutex mechanism and allocator limit support
  (the related AP_MPM_WANT_foo defines no longer exist)


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to allow filenames with globbing characters to be retrieved instead of
presented in a directory listing.

Submitted by: Dan Poirier <poirier pobox.com>
Reviewed by: covener



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remove leader, perchild, and threadpool MPMs (other than non-English bits in common parts of the manual)


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a string can't be used as the declined value since the hook macro must compare 
retcodes from hooks with that declined value

(thanks, gcc/Joe)

accommodate in ap_show_mpm() since we don't want to return NULL to the caller of
this simple API


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after module loading if there is no built-in MPM

(we could just defer displaying the MPM info, but that would change the order of
output from what people/scripts expect)


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linked MPMs


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