Makefile-distrib: include install-sh script in source distribution
(mandatory for autoconf).
Enable simulator by default (for automatic builds on pipol: some ctest
versions does not allow options passing to configure scripts).
Makefile-bin: only install target, for binary distribution
Makefile-distrib: two targets, binary-distrib (builds a binary distribution
based on the current configuration) and source-distrib (builds a source distribution)
