* doc/groff.texinfo: Add extra info about `.asciify'.

Document new gropdf options -u and -s.

* src/devices/gropdf/gropdf.man: Remove references to Type 42 fonts,
they do not work in PDFs.
Document new option -s which adds `statistics' line to end of PDF
file showing number of pages in document.  This has always been the
default behaviour (to add this line), all other software seems to
ignore it as intended, but `gs' sometimes complains, so the default
is now to omit the statistics.
Document new option -u[cmapfilename] to allow a user ToUnicode CMap
instead of gropdf's default.  If no `cmapfilename' given then do not
include any ToUnicode CMap.

* src/devices/gropdf/gropdf.pl <top>: Allow `bundled' flags on
command line (i.e. -de = -d -e).
Use $RT_SEP as multi path separator, not hard coded `:'.  Update all
users.
New flags -u and -s.
Once a custom papersize has been set as \X'papersize x,y' make it
sticky so all following pages use custom size.
When importing pdf with \X'pdf: pdfpic ...' do not compress objects
which are already compressed!  This caused problems with PDFs
created with ImageMagick, now fixed.
(IsText, PutLine, do_t): The troff `u' command can contain a kerning
adjustment number, this was not being handled, now fixed.
(do_c): The troff `c' command was not being handled correctly, now
fixed.
(FindChar, RemapChr, do_N): Handle fonts with more than 255 glyphs.
($ucmap): Define CMap ToUnicode to convert ligatures
(fl,fi,ff,ffl,ffi) back to individual characters, useful for
cut'n'paste and text searching.
(LoadFont): Handle it.
(ToPoints, GetPoints): Handle `z' unit.
(do_x, FixPDFColour, PutHotSpot): Allow Annotation colour to be
groff colour, i.e. 0-65535 *3, or #rrggbb, or #rrrrbbbbgggg.
(do_p):The papersize width/length in switch -p were reversed,
corrected.

* src/devices/gropdf/Makefile.sub (gropdf): Use $RT_SEP.
Use $fontpath rather than $fontdir (this ensures site-font is
included in searches).

* tmac/pdf.tmac (PDFBOOKMARK.VIEW, PDFHREF.VIEW, PDFPAGE.Y): Fix
strings.
(pdfbookmark): Correct handling of bookmark levels.
Convert \[em] to hyphen in bookmarks
Rather use -N than -T for "named" bookmarks (-T already used for "tag"
in pdfmark.tmac)
(.pdfclean): New macro which attempts to asciify bookmark text.
(.pdfpagename): New wrapper macro for \X'pdf: pagename'.
(.pdfswitchtopage): New wrapper macro for \X'pdf: switchtopage'.

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