Remove use of TMatrix in Yiqun

The energy TMatrices were populated in StFmsPointMaker and passed to
Yiqun. However, they were then only used to populate a list of TowerFPD
objects in Yiqun, so it is simpler to just directly create those
TowerFPD lists in StFmsPointMaker and pass them to Yiqun, and avoid the
intermediate step of energy matrices.
Move Yiqun inside loop over detectors

Declare Yiqun objects locally inside the detector loop of
StFmsPointMaker. This is simpler than allocating them to an array, as
they are never used outside the loop. It also fixes a memory leak, as
the allocated Yiquns were never freed.