Python Support: hotshot2cachegrind

Thanks goes to Joerg Beyer for this contribution !

For usage, this is an excerpt from the top of the script:

 #!/usr/bin/env python
 # ...
 # This script transforms the pstat output of the hotshot
 # python profiler into the input of kcachegrind.
 #
 # example usage:
 # modify you python script to run this code:
 #
 # import hotshot
 # filename = "pythongrind.prof"
 # prof = hotshot.Profile(filename, lineevents=1)
 # prof.runcall(run) # assuming that "run" should be called.
 # prof.close()
 #
 # it will run the "run"-method under profiling and write
 # the results in a file, called "pythongrind.prof".
 #
 # then call this script:
 #     hotshot2cachegrind -o outputfile inputfile
 # or here:
 #     hotshot2cachegrind -o cachegrind.out.0 pythongrind.prof
 #
 # then call kcachegrind:
 #     kcachegrind cachegrind.out.0
 ...