refactor(prp): factor out routine for particle release (#1907)

Some cleanup in the particle release package. More consistent variable names. Factor out routines to calculate release time and release the particle. Also, add a value 0 -> "default" for the DEV_EXIT_SOLVE_METHOD option, and defer the selection of a default root-finding algorithm to the ternary method rather than the PRP package.
MODFLOW-USGS · Jun 27, 2024 · 12dea73 · 12dea73
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diff --git a/doc/mf6io/mf6ivar/dfn/prt-prp.dfn b/doc/mf6io/mf6ivar/dfn/prt-prp.dfn
@@ -24,7 +24,7 @@ type integer
 reader urword
 optional true
 longname exit solve method
-description the method for iterative solution of particle exit location and time in the generalized Pollock's method.  1 Brent, 2 Chandrupatla.  The default is Brent.
+description the method for iterative solution of particle exit location and time in the generalized Pollock's method.  0 default, 1 Brent, 2 Chandrupatla.  The default is Brent's method.
 
 block options
 name exit_solve_tolerance