Autoconf: Fix Python test and allow configuration #371
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The AC_PATH_PROGS macros used in Python testing were incorrectly using AC_MSG_ERROR in places where a missing value for PYTHON should be if the executable was not found.
It also did not permit for a configurable PYTHON variable, since the autodetect was always run, even if PYTHON were set.
This has been updated so that Python autodetection only runs if PYTHON is unset. It also correctly reports a failed configuration if PYTHON is not found.
(It does not, however, test of PYTHON is actually a Python interpreter, but we can deal with that at a later date.)