"extensions" is now the offical place for storing extension modules

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@2238 a333f486-631f-4898-b8df-5754b55c2be0

extensions/readme.txt

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+Place extensions modules in this directory. They will be taken into account by the setup program and safely copied in case of upgrade.