Checks that object myfun is a list and check the elements of the list for: that element names are as expected, that value of each element is of the expected type and length.
check_myfun(myfun, windowsizes)See applyExtFunction
See g.getmeta).
0 if all checkes passed, 1 if one or more checks did not pass. Error message are printed to the console with feedback on which checks did not pass.