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* Support fold level configuration using `.SCITECO_FOLDLEVEL`.
This sets the current output line as the fold header and all subsequent lines
with the given fold level (until another `.SCITECO_FOLDLEVEL` instruction
is encountered).
* This is now done automatically for man's SH and SS macros,
so the man-page based woman pages provide folding.
* The folding margin is therefore now always enabled in fallback.teco_ini.
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* This is rendered with ms, so we now need the entire groff on Debian.
This is not a big deal as it just adds a few kilobytes of build-time dependencies.
Most platforms do not allow installation of some "groff-base" package anyway
and always draw in the entire package.
* sciteco.tmac has been extended to disable page breaks on ms.
* The tutorial is installed like any other woman page and can be invoked
interactively with ?tutorial$.
* It is optimized to be still usable on a plain 80x24 terminal.
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This could theoretically be used to apply Scintilla styles not natively and easily supported by grosciteco,
eg. different fonts and font sizes.
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* Hopefully disables paragraph breaking in newer Groff versions,
but needs to be tested.
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* fixes manpages, Groff warnings and building
womanpages for older Groff versions.
Groff v1.19 is in use eg. on FreeBSD 11.
* tbl v1.19 has different column specifiers than
on later versions. `X` cannot be used for expanded
columns in these Groff versions.
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* we had an undocumented dependency on Groff v1.20, since
this version introduced the .device request.
* this broke the womanpage generation e.g. on OS X 10.6.
Even newer versions of OS X only appear to ship Groff v1.19.
* Since it makes sense to support the Groff shipping with OS X,
we work around this issue by reimplementing .device on platforms
that lack it.
* The fallback implementation still has subtle differences to
the real .device, but they are acceptable for the time being.
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* the new "?" (help) command can be used to look up
help topics.
* help topics are index from $SCITECOPATH/women/*.woman.tec
files.
* looking up a help topic opens the corresponding "womanpage"
and jumps to the position of the topic (it acts like an anchor
into the document).
* styling is performed by *.woman.tec files.
* Setting up the Scintilla view and munging the *.tec file
is performed by the new "woman.tes" lexer.
On supporting UIs (Gtk), womanpages are shown in a variable-width
font.
* Woman pages are usually not hand-written, but generated from manpages.
A special Groff post-processor grosciteco has been introduced for this
purpose. It is much like grotty, but can output SciTECO macros for styling
the document (ie. the *.woman.tec files).
It is documented in its own man-page.
* grosciteco also introduces sciteco.tmac - special Troff macros
for controlling the formatting of the document in SciTECO.
It also defines .SCITECO_TOPIC which can be used to mark up
help topics/terms in Troff markup.
* Woman pages are generated/formatted by grosciteco at compile-time, so
they will work on platforms without Groff (ie. as on windows).
* Groff has been added as a hard compile-time requirement.
* The sciteco(1) and sciteco(7) man pages have been augmented with
help topic anchors.
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