Minor fixes to sumsqv, abmaxv.

Details:
- Minor update to bli_sumsqv_unb_var1() to bring it up-to-date with
  LAPACK 3.5.0's zlassq.f, which, starting with 3.4.2, returns NaN when
  the vector (or matrix) contains a NaN.
- Minor change to bli_abmaxv_unb_var1() to more closely mimic the
  behavior of netlib BLAS's izamax(). There, a "less than or equal to"
  operator is used in the search instead of "less than", which would
  change the element index returned if there were multiple maximum values.
- Added macro function definitions for bli_isinf() and bli_isnan(), which
  are currently implemented in terms of isinf() and isnan() from math.h.
Reorganized norm operations.

Details:
- Completely reoganized norm operations:
  - Renames:
    - fnormsc, fnormv, fnormm -> normfsc, normfv, normfm (2-norm)
    - absumv -> norm1v (vector 1-norm)
  - New operations:
    - norm1m (matrix 1-norm)
    - normiv, normim (infinity-norm)
    - amaxv (BLAS-like absolute maximum value index)
    - asumv (BLAS-like absolute sum)
- Deprecated absumm, as it did not correspond to any actual norm.
  (However, an inlined version now exists in the testsuite module for
  randm.)