Restructure cpu-time simulations

[jarlebring]

The cpu-time simulations are a bit messy. The language simulations can be organized more like c_cputime.jl and the Makefile

• [ ] gen_cputime_all_languages.jl: Generates
  • [ ] c-files (as currently done by c_cputime.jl)
  • [x] m-files: one for each graph + one which produces timing run_julia_timing.jl from a template file
  • [x] jl-files: one for each graph + one which produces timing run_matlab_timing.m from a template file

Makefile modes

• [x] gen: generates files for all languages
• [x] run_matlab: runs matlab cputimings: calls run_julia_timing.jl
• [x] run_julia: runs julia cputimings
• [x] run_c: runs all c-timing.
• [x] run: run all

[mfasi]

I added the target to the Makefile and made some minor modifications. As far as I can tell, gen_cputime_all_languages.jl now also generates the c-files thus gen_cputime_all_languages.jl can probably be deleted.

[jarlebring]

You are right that c_cputime.jl, matlab_cputime.jl and julia_cputime.jl can be deleted as far as I can tell.

[jarlebring]

For consistency, I think it would be better if the "glue code" generation for c could also be done in gen_cputime_all_lang.jl rather than sed-calls in the makefile. It can be a function like gen_main_c(). (I'm very busy this week so if someone else wants to give it a shot...)