v2 talloc leak report

[david at tethera.net]

Obsoletes 

	  id:1355714648-23144-1-git-send-email-david at tethera.netZ

[Patch v2 1/4] CLI: add talloc leak report, controlled by an
- comments and formatting

[Patch v2 2/4] util: add talloc-extra.[ch]
- rename, fix dangerous memcpy

[Patch v2 3/4] notmuch-restore: use debug version of talloc_strndup
no change, except new names

[Patch v2 4/4] perf-test: initial support for talloc leak report in
New patch, use talloc reports in memory tests.