Brownian Dynamics Parameters

Details of the method and algorithms are described in §3.3.

	peclet       : peclet number (negative means no Brownian force)
	length       : unit of the length scale [nm]
	BD-seed      : seed for Brownian force random number generator
	n-cheb-minv  : number of Chebyshev coefficients for M^{-1}
	n-cheb-lub   : number of Chebyshev coefficients for L
		(if zero is given, use Cholesky decomposition)
	BD-scheme    : Brownian dynamics time integration scheme
		"mid-point"        The mid-point algorithm.
		"BanchioBrady03"   Banchio and Brady (2003).
		"BallMelrose97"    Ball and Melrose (1997).
		"JendrejackEtal00" Jendrejack et al (2000).
		"semi-implicit-PC" semi-implicit predictor-corrector.
		"SI-connector"     semi-implicit for connector vectors.
	BB-n         : step parameter for Banchio-Brady03 algorithm.
	BD-nl-solver : nonlinear solver for implicit schemes
		"GSL"    GSL multiroot solver
		"NITSOL" Newton-GMRES solver by Pernice and Walker (1998)
		"fastSI" fast semi-implicit solver (only for "SI-connector")

* dt-ajustment parameters for Brownian dynamics
	NOTE: if rmin is defined by non-zero, the process is skipped.
	BD-rmin : overlap-param for dt-adjustment process in BD.
	          the condition is (r2 < rmin * a2).
	dt-lim  : lower bound to shrink dt to prevent overlaps.
	          set equal to "dt" if you don't want to adjust "dt"
	          but just reject it.