Make array view structures non constant.

This fixed testsuite/code/vobla/simple/voidcall.vobla
test failure.

PENCIL code, generated by VOBLA contains assignments to the fields
of these structures.

Change-Id: I25c0ab3dcb2c9b1d2cd2dc2fb21a4361294f19a7
Support pencil dir outside vobla dir.

Change-Id: I6c0fd6f3ced847e8747768f14ccbbeb912c17464
Check for BLAS testsuite before test run.

Change-Id: I999041f5edf876e5836619f33316885dffb09289