code into a single stack per handlers (for correct interleaving).

Changed the syntax so that now they are of the form

phpUriHandler /filename
phpUriHandlerMethod Class::Method

This now works for all handlers including response handlers.

declared in a phpRequire statemenet, of course, or be otherwise available
at the hook run-time (builtins)).  This is currently only implemented
for the uri trans handler  it is usable as:

phpUriHandlerCodeRef MyClass::MyMethod

This can be greatly robustified from whre it stands now, but is a good proof
of concept (hopefully!)

as class methods for the ApacheRequest objects.  broke sapi_activate
into two functions to allow for reading of headers/cookies separately
from request bodies (POST stuff).  Altered some of the send_headers code
in mod_php4.c to prevent sending headers twice (since a phpResponseHandler
needs to be able to have full freedom for setting headers using the
ap_*_header* functions.

working.  Added protections to mod_php4's internal call to the same so
that headers cannot be accidentally sent twice.