Use EPIPHANY_BUILD_HOME environment variable for the build root. Tabified the script for consistency and because there were a mix of TAB and whitespace used. Changed VERSION variable name to BLD_VERSION for clarity. Added -t/--toolprfx script options to override CROSS_COMPILE environmrnt variable. Removed CROSS_PREFIX variable.
Clone parallella-linux-adi tree
Fixed export of PARALLELLA_LINUX_HOME env var.
Copy epiphany-shm-manager.h during install
Copy a_trace.h during install