move automake back to before autoconf

autoheader must be called after autoconf, automake after autoheader

added ext/*/config.h.stub files
removed config.h.in (generated)

convert libzend to automake

keep old files if they are not modified

run automake and run autoconf in libzend

* Added buildconf, runs all the scripts necessary to build configure (Stig - if there's any way
to detect whether we need to run 'automake --add-missing', please add it...)
* Make vpath wor

* Added buildconf, runs all the scripts necessary to build configure (Stig - if there's any way
to detect whether we need to run 'automake --add-missing', please add it...)
* Make vpath work again
* Minor UNIX bugfixes

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