Use autoreconf, not autoconf&&automake&&etc in autogen.sh
The autoreconf tool deals much better with detecting which tools to
use on your particular platform, handling cases where your
install-sh script gets stable, and lots of other little tricky
We still fall back to autoconf&&automake&&etc in the case where
"`which autoreconf 2>/dev/null`" says something we can't run.
This is the first change of the 0.2.3.x series.