output styles: The default is similar to the old FSF gprof,
while -T sets the variable bsd_style_output, which causes
output matching Berkeley's gprof. The biggest differences
are that with the FSF style output, the flat profile comes
before the call graph; numbers come before explanations;
and there is less gratuitous white space.
* gprof.h, gprof.c, printfgprof.c: New discard_underscores
variable causes discarding of initial underscores when
printing symbol names. It is set unless there is a "main"
symbol (without an underscore).
* printfgprof.c: New function printnameonly(), called
by printname(). It handles stripping of initial '_',
as well as C++ name-demangling.
* gprof.callg, gprof.flat, make-c-prog.awk: Removed.
It is just as convenient to edit blurbs.c directly.
* Makefile.in: Removed rule for making blurbs.c.
* blurbs.c: This is now a true source file (as opposed
to being generated from gprof.callg and gprof.flat).
Change style to use one long string literal, instead of
one literal per output line. Add FSF-style blurb for call graph.
