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Adding such comments was discussed and agreed on jabber with Jinmei.

Some versions of GCC warn about some versions of Boost regarding
missing initializer for members in its posix_time.
https://svn.boost.org/trac/boost/ticket/3477
But older GCC compilers don't have the flag.

This is the same as on a few other Makefiles too.

* Supply --enable-valgrind to configure to run tests (make check)
  under valgrind

* Use two classes of suppressions files:
 + src/valgrind-suppressions for permanent suppressions that we
   never want to re-consider again
 + src/valgrind-suppressions.revisit for temporary suppressions
  (such as issues in testcases) that are not a priority to fix,
  but we'd like to fix them sometime

Some of the pktN protected variables are still accessed directly in derived
classes thus warnings have been added in libs.

my git hook complained:
	tests/tools/perfdhcp/Makefile.am:22: new blank line at EOF.

Improved error checks, comments, additional unit tests added.