26.1: calc-mode header line [PATCH]

[Boruch Baum]

Back in version 21, emacs introduced a static 'header-line' that could
be inserted at the top of any buffer. Calc mode is one emacs package
that does not use it and could benefit from it, so the attached patch
offers that feature. The main benefit is that the 'calc trail' buffer
(what some greybeards from the mechanical age would remember as the
'tape reel') no longer has its title line scroll off the visible
window. The patch also includes:

1) Width-sensitive text for the header line, so that it is readable for
   very narrow windows, and scales to very wide windows.

2) Display of the 'calc trail' buffer when invoking calc from a frame
   that is split vertically (C-x 3, M-x split-window-right).

3) My version of emacs includes a unicode character at 'C-x 8 <return>
   POCKET CALCULATOR', that I did not include in the header line as the
   mode's icon, but that could be done.

The patch was diff'ed against the version of emacs that I have: the
latest-and-greatest that debian is distributing ... v26.1

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calc.patch
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