convert to new RCS id conventions.

`s3' applies the last substitution to the 3rd (or nth) match.
Split up the code to several files.

Added a line-addressing test so this isn't overlooked again.
Added BACKWARDS directive to Makefile for compatibility.
Completely changed the name space as per FSF's request.
Fixed a line-addressing b

Added a line-addressing test so this isn't overlooked again.
Added BACKWARDS directive to Makefile for compatibility.
Completely changed the name space as per FSF's request.
Fixed a line-addressing bug introduced by previous `fix', i.e.,
space preceding a digit acts a plus (+) operator, as in `1 1' == `2',
and a plus operator by itself acts as +1, but a space by itself
should not equal a plus operator, i.e., `1 ' != `1+' == `2'.

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rename !* -> bang* and \n* -> nl*

Added more tests...

added support for lines of arbitrary length
added support for 8-bit data, including NULs

updated to alm's ed-0.2

added ed, from Andrew Moore, alm@netcom.com