* tests/base.test, tests/boot.test, tests/macro.test, tests/perform.test, tests/quasiquote.test, tests/read.test, tests/scm.test, tests/srfi-0.test: Default to bin/mes.
* build-aux/build.sh.in: Build bin/mes. Update scripts and users. * build-aux/bootstrap.sh.in: Update. * build-aux/install.sh.in: Install all built bin/mes-* flavours. * configure: Drop SEED, support --bootstrap. * configure.sh: Likewise.
* src/strings.c: New file. * src/mes.c: Use it. Update users.
* module/mes/test.scm (pass-if-timeout): New macro. * tests/perform.test: New test. * build-aux/check-mes.sh (tests): Run it.