change from manual config.h.in to autoheadered

[Bob Lockie]

I changed a configure to use AM_CONFIG_HEADER(config.h)

dnl defined by AM_INIT_AUTOMAKE
AH_TEMPLATE([PACKAGE], [arson package])
AH_TEMPLATE([VERSION], [arson version])
and now config.status --recheck is called when I run make.

I think it is because of those changes but I made other changes. :-(
Maybe this is a common problem.