working branch for idl

svn path=/branches/iCub-idl/; revision=21729
[iCub-idl branch] Added repository structure for idl and generated files; added velocityControl example; new version of icub_export_library macro

svn path=/branches/iCub-idl/; revision=21794
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svn path=/branches/iCub-idl/; revision=22304
updated from trunk

svn path=/branches/iCub-idl/; revision=22311