Reads and calculates the line density (in execution time or memory)
of an aprof object returned by the aprof function.
If a sourcefile was not specified in the aprof object, then the first file
within the profiling information is assumed to be the source.
readLineDensity(aprofobject = NULL, Memprof = FALSE)An object returned by aprof, which
contains the stack calls sampled by the R profiler.
Logical. Should the function return information specific to memory profiling with memory use per line in MB? Otherwise, the default is to return line call density and execution time per line.