run_tests.sh: when a test fails, show the exit code
argrsHasSafePointer: fixed issues in indexing

Fixed the case when there were less than three arguments (integer
overflow)
ClampPointers: with -debug, output the unsafe-safe signature mapping
pocl_kernel: implemented vstore/vload for all address spaces
run_kernel: removed a superfluous usage message parameter
Added vload and vstore implementation from pocl-0.7
run_kernel: compile and link library.cl

This provides access to actual implementations of (some) Cl functions