move Base_getDiffBetweenDateAndNow from erp5_gadget to erp5_base as it is...

move Base_getDiffBetweenDateAndNow from erp5_gadget to erp5_base as it is context independent and can be useful in many other situation than gadget (like reports, ...)

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@34562 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_base/bt/revision

-716
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+712
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bt5/erp5_knowledge_pad/bt/revision

-505
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+506
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