simplify greatly the implementation, work less in advance.

Rebase : Use the new call_prover interface

which appear only in the type value

Currently all the variables that appear in the return value
are used as supplementarry argument.

rebuild provers-data-conf when necessary; support for Gappa 0.14.0 (but Gappa's driver still to be fixed)

If apidoc.tex is ever included in manual, this line should be
uncommented and manual.pdf should depend on apidoc.tex in Makefile