Ferite profiling

RUn configure with --enable-profile, then

    $ ferite --fe-profile=out.json <file.fe>

Feed out.json to fprof[1] to produce the html reports.

Profile metrics are saved into the given file at atexit(3)

[1] https://github.com/cention-nazri/fprof
Add line field in FeriteFunction

native_information->line holds the same information, there were no
equivalent information for non-native functions.

Eventually these two locations should be consolidated as one - the next
commit after this one will do it.
Consolidate line field information for native and non-native functions
Expand "%i" in profile filename pattern to process id