* internal: support optional filter expression for debug.stacks
* internal/debug: fix string regexp
* internal/debug: support searching for line numbers too
* debug: Use pprof goroutine writer in debug.Stacks() to ensure all goroutines are captured.
* Up to 64MB limit, previous code only captured first 1MB of goroutines.
* internal/debug: simplify stacks handler
* fix typo
* fix pointer receiver
The debug package provides an RPC wrapper for glog settings and the
debugging facilities of the Go runtime. They can be triggered through
both command line flags and the IPC listener.
