Gaspard2 UML profile documentation

This document describes the current UML profile of Gaspard2. This profile extends the UML semantics to allow the user to describe a SoC (System-on-Chip) in three steps: the application (behavior of the Soc), the hardware architecture, and the association of the application to the hardware architecture. The application is represented following a data flow model, but additional mechanisms permit the usage of control flow on those applications. In addition to those notions, the profile contains a package introducing factorization mechanisms to enable the compact description of massively parallel and repetitive systems