mrgsolve 1.5.2

• Add $EVENT block for writing code related to dosing or other events that
  are implemented through model code rather than the data set (#1230).

• Add evt::reset() and evt::reset(self) functions under the evtools
  plugin; these reset the compartments in a model; overloaded functions are
  also provided to reset and dose with bolus or infusion (#1222).

• Completed dosing functionality in evtools plugin; use evt::addl() to
  schedule additional doses through an evt::ev object; use evt::ii() to
  set the dosing interval; use evt::ss() to advance the pharmacokinetic
  system to steady state just prior to dosing; evt::cmt() sets the compartment
  number; evt::amt() sets the dose amount; evt::rate() sets the infusion
  rate; see the user guide for the specific signatures that are available
  (#1227).

• Add evtools model to modlib(), illustrating how to implement dosing
  regimens from inside the model a few different ways (#1230).

• Added more comprehensive checking for duplicate blocks in a model file;
  duplicate blocks are always handled when allowed; an error message is always
  issued when duplicates are not allowed (#1238).

• Code to audit $ODE (or $DES) code, looking for an equation for every
  model compartment was refactored to use a common approach for both traditional
  models and models written with the nm-vars plugin; regardless of approach,
  the user will be warned if mrgsolve does not detect code relevant to every
  model compartment; the audit system can be bypassed by including the
  @!audit block option to $ODE (#1235).

• The autodec plugin was lightly refactored to avoid false positive detection
  of variables declared as double; plans are in place to narrow the
  scope of what is detected for declaration in future releases (#1234).

• R help files (.Rd) reviewed and revised for consistency and formatting
  (#1246).