Fixes #3628 - Add rudder_stdlib.st
Merge pull request #134 from nperron/ust_3627/dev/3628_backport_rudder_std_lib.st

Fixes #3628 - Add rudder_stdlib.st
Merge branch 'branches/rudder/2.3' into branches/rudder/2.4
Move policies/system/common/1.0/rudder_stdlib.st to techniques/system/common/1.0/rudder_stdlib.st in order to be 2.4+ compliant during the merge between 2.3 and 2.4