Multiple Stokes and Anti-Stokes Picosecond Generation, cw Laser Action at Wavelengths of Two Stimulated-Emission Channels $^4F_{3/2}$ $\rightarrow$ $^4I_{11/2}$ and $^4F_{3/2}$ $\rightarrow$ $^4I_{13/2}$, and Nanosecond Self-SRS Lasing in Undoped and Nd$^{3+}$-Doped Tetragonal PbMoO$_4$ Crystals