fit_limit argument to run_method() that aborts a fit exceeding the
given number of minutes and returns a standard failure result with
note = "time limit exceeded with <fit_limit> minutes". The fit runs in a
reused background R process so that methods sitting in compiled sampling
code (RoBMA, RTMA, MMPH) can be stopped as well.measure() function to list available performance measures (renamed from measures()).measure_mcse() function to list available performance measure MCSE functions.measure() and measure_mcse() to retrieve specific functions (e.g., measure("bias"), measure_mcse("bias")).method() and dgm() to list available methods and DGMs when called without arguments.method() and dgm() to return the corresponding function when called with a single argument (e.g., method("RMA")).measure(), measure_mcse(), method(), and dgm() now dynamically retrieve available options using methods().Initial CRAN submission.