2nd general release of make debugger

[R. Bernstein]

The change from last release.

* First debugger documentation.

* Add "write" command - ability to write target commands to a file
  with MAKE variables expanded, or show that inside a debugger
  session.

*  Add ability to print specified attributes of a target, e.g. "time",
  "deps", "vars"... 

* Improve reporting target locations.

* Improve target stack tracking.

* Separate "info" from "show". Make these act more like they do in gdb

* Stay in debugger when a makefile exits.

Source tar can be downloaded from:
  
http://prdownloads.sourceforge.net/bashdb/remake-3.80%2Bdbg-0.2.tar.gz?download

There's plenty still to do, but there's also plenty to work with now.