Details:
- Added yet another 4m-based implementation for complex domain level-3
operations. This method, which the 3m/4m paper identifies as Algorithm
"4m_1b" fissures the first loop around the micro-kernel so that the
real sub-panel of the current micro-panel of B is multiplied against
(both sub-panels of) all micro-panels of A, before doing the same for
the imaginary sub-panel of the micro-panel of B. For now, only gemm is
supported, and 4m_1b (labeled "4mb" within the framework) is not yet
integrated into the test suite.