dd easyconfigs for PerfExpert, ROSE, HPCToolkit + deps

I've deliberately used a `dummy` toolchain here, to obtain a PerfExpert build that works with other toolchains too...

This is not airtight though, mostly because of the huge list of dependencies. If PerfExpert is to be used with a particular application that has a dependency in common with PerfExpert, PerfExpert will need to be built with the same compiler toolchain to make them compatible.

This might be troublesome, since e.g. ROSE requires a GCC 4.4 or older 4.x (so I should probably use a GCC-4.4 module as build dependency for ROSE to make sure that build works).