[Bashdb-remake] remake rewritten off of base GNU make 3.82

[Rocky B. <ro...@gn...>]

I've just released a new version of the GNU Make debugger (with better
tracing and error reporting) which is based on the the GNU Make 3.82
sources.

The file NEWS.readme in the distribution has more detail, but suffice it to
say this is an important rewrite and release. Things are lot cleaner now and
the code runs the GNU 3.82 regression tests.