'make CFLAGS=-g -O0' at top level now works.
For: gdb --args dmtcp_launch a.out;(gdb) r;^C;cont
Merge branch 'master' of https://github.com/dmtcp/dmtcp

Conflicts:
	contrib/ckptfile/Makefile.in
	contrib/infiniband/Makefile.in
	plugin/batch-queue/Makefile.in
	plugin/modify-env/Makefile.in
	plugin/ptrace/Makefile.in
	plugin/unique-ckpt/Makefile.in
	src/plugin/alloc/Makefile.in
	src/plugin/dl/Makefile.in
	src/plugin/ipc/Makefile.in
	src/plugin/pid/Makefile.in