build: adds an Autotools-based build system to DYAD

This commit consists of the following changes:
* Adds initial configury files
* Adds the Makefile.am files for the Autotools build setup
* Add libtool initialization to configure.ac
* Tweaks a few things for Automake and Autoconf to improve the build
* Adds -module to the linker flags for dyad.so so that Automake doesn't
  require a 'lib' prefix to the so name
* Adds 'dyadrun', a script meant to help users with setting the
  environment variables needed to run DYAD
* Adds a .gitignore file to the repo
* Adds 'autogen.sh' from flux-core to help with
  building DYAD
* Adds debug support and removes CPA from the build
* Tweaks the configury to be more consistent with other Flux repos
* Adds URPC, but currently does not add libb64 linking

.gitignore

@@ -0,0 +1,103 @@
+# Mostly copied from the Flux-Core gitignore:
+# https://github.com/flux-framework/flux-core/blob/master/.gitignore
+
+# http://www.gnu.org/software/automake
+Makefile.in
+# http://www.gnu.org/software/autoconf
+autom4te.cache
+compile
+configure
+aclocal.m4
+stamp-h1
+aclocal.m4
+config.guess
+config.sub
+depcomp
+install-sh
+ltmain.sh
+missing
+config.log
+config.status
+config.h
+config.h.in
+config.h.in~
+libtool
+.deps/
+.libs/
+libltdl/
+
+# generated library version header
+/src/common/libflux/version.h
+
+# libtool pull-ins
+/config/libtool.m4
+/config/ltoptions.m4
+/config/ltsugar.m4
+/config/ltversion.m4
+/config/lt~obsolete.m4
+
+# docs intermediate files
+/doc/man*/*.xml
+/doc/_build
+
+# Object files
+*.o
+*.ko
+*.obj
+*.elf
+# Libraries
+*.lib
+*.a
+*.la
+*.lo
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+# Executables
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+*.pyc
+*.pyo
+# gcov output
+*.gcno
+*.gcda
+
+# autoconf-preprocessed
+Makefile
+*.1
+*.3
+*.5
+*.7
+*.8
+*.spec
+*.pc
+
+# misc
+*.swp
+*.diff
+*.tar.gz
+*.orig
+*.core
+*.tap
+.coverage*
+*.trs
+*.log
+.dirstamp
+
+# ignore local, maybe generated tooling files
+compile_commands.json
+compile_flags.txt
+
+# local editor config dirs
+.vscode
+.idea
+.clangd
+
+# ignore installable version of dyadrun
+dyadrun

Makefile.am

@@ -0,0 +1,15 @@
+ACLOCAL_AMFLAGS = -I config
+
+SUBDIRS = . src
+
+dist_bin_SCRIPTS = dyadrun
+
+dyadrun:
+	$(SED) -e 's,[@]libdir[@],$(DESTDIR)$(libdir),' dyadrun.in > $@\
+		&& chmod u+x $@
+
+clean-local:
+	rm -f dyadrun
+
+uninstall-local:
+	rm -f $(DESTDIR)$(bindir)/dyadrun

autogen.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+#
+# Run an extra libtoolize before autoreconf to ensure that
+# libtool macros can be found if libtool is in PATH, but its
+# macros are not in default aclocal search path.
+#
+echo "Running libtoolize --automake --copy ... "
+libtoolize --automake --copy || exit
+echo "Running autoreconf --force --verbose --install"
+autoreconf --force --verbose --install || exit
+echo "Now run ./configure."