Demonstration of PSyclone-based source-code processing

Context

The recent integration of a PSyclone-based source-code processing option into the NEMO build system has a wide variety of potential applications. Its utilisation and the addition of new transformations, however, remains somewhat complex. While a description of the PSyclone source-code processing option is planned to be included into the NEMO user guide (nemo/doc/guide#22 (closed)), it is unlikely to provide very detailed demonstration of various aspects of the new source-code processing option.

Proposal

This action intends to start the addition of detailed how-to documents and potentially other modifications that demonstrate different aspects of PSyclone-based source-code processing, initially a demonstration of the PSyclone passthrough (PSyclone processing without functional source-code transformation or compiler-directive addition).