add hg support for ff/js configure driver.
Added llvm bin driver that redirects to installs in ~/opt/llvm/bin.
These should all be symlinks to llvm-opt-redirect.sh driver script.
Follow my new naming convention for configure driver scripts.
Autogenerate the configure scripts when they are not already present.

(But its not sufficiently sophisticated to regenerate them when they
are out of date.  Still, this should be an improvement for clean-slate
builds for me.)
Some changes to work-around build issues I encountered on mozilla-central.

Though in truth maybe the instruments business is no longer necessary.
I am not sure yet.
Switch from locally-build llvm+clang to system llvm+clang.

I was having serious stability issues with the former (in terms of
generating binaries that I could not properly debug).
Change default rust to the dbg-nopt build.
Tools for rendering ionmonkey cfgs from IONFLAGS=logs
Very cool CFG visualization tool recommended by Shu.
A script for building nspr I hope.
Merge branch 'master' of github.com:pnkfelix/BinFiles

Resolved conflicts:
	rust-opt-redirect.sh
Various new wrapper scripts.
Switch back to my locally-built gdb.
Add rust-nopt dir and made it default.

Add rust-nopt dir and made it default (corresponds to objdir with no
-dbg nor -opt).
add gcgen options to js-configure script.
Merge remote-tracking branch 'origin/master'

Resolved conflicts:
	js-configure
	rust-opt-redirect.sh