Remove src/tool/backend, now that the content is on the web site and wiki.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/63f1ccd838a19e4a0923221b2f90e4e014cabf74

Modified Files
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src/tools/backend/README            |    4 -
src/tools/backend/backend_dirs.html |  349 -----------------------------------
src/tools/backend/flow.fig          |  143 --------------
src/tools/backend/flow.gif          |  Bin 501221 -> 0 bytes
src/tools/backend/index.html        |  155 ----------------
5 files changed, 0 insertions(+), 651 deletions(-)

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