Consolidate and fix blas

Description

Consolidation and bugfixes of the Blas interface:

• Adding ASSERTs to check for array dimensions
• Bugfix in the routine X(symv_2): the leading dimension of b was wrong
• Specifying lead_dim instead of explicit sizes in Blas 2 and 3 routines if missing
• Bugfix: gemm_2 and gemmt_2 routines was wrong
• The routine symm_2 is remove as it is not used and does not make really sense

News snippet

Consolidation and bugfixes of the Blas interface.

Checklist

• I have checked that my code follows the Octopus coding standards
• I have added tests for all the new features added in this request.