20031116 Math::RungeKutta Numerical Integration
20031117 rk_auto works using double-step
20031118 adopt Merson's method as the default rk4
20031118 rk4_auto saves and reuses @f0
20031119 more robust timestep adjustment
20031119 bugs fixed & extra robustness in rk4_auto
20040809 'perl Install' works better on solaris without Term::Size
20050121 1.01 test.pl uses Test::Simple
20051203 1.02 ./example scripts tidied up