PerfTest: code refactor
Add more precise information per descriptor through the optional `info` static method. The adaptive tree descriptor gives information about the options. Remove old help message hints that aren't relevant anymore. Rename DescriptorLookup.hpp to TestDriver.hpp Allow tree descriptor to adapt to kernel descriptor: the node data and particle containers are now retrieved from the kernel descriptor type definitions. Add some comments. Add FCountKernel descriptor.
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