revamp oct-conf.h * oct-conf.in.cc: New file. Use character strings in a namespace instead of macros to define configuration info. Omit configuration info beginning with ENABLE_ since those appear as macros in config.h * oct.conf.h: New file. * oct-conf.in.h: Delete. * config-features.sh: Also recognize macros beginning with ENABLE_ * toplev.cc (octave_config_info): Update to match changes in oct-conf.h and oct-conf-features.h. * __init_gnuplot__.cc (have_gnuplot_binar): Likewise. * libinterp/module.mk: Update for new files.

gnulib-hg = gnulib-hg