* src/devices/grohtml/post-html.cpp (text_glob::text_glob):

* src/devices/grohtml/post-html.cpp (text_glob::text_glob):
Add `const' to second argument.
(html_printer::add_table_end): Add `const' to argument.
* src/devices/grohtml/html-text.cpp (html_text::issue_tag): Add
`const' to arguments.
* src/devices/grohtml/html-text.h: Updated.

* src/devices/grolbp/charset.h (symset): Use `unsigned char'.
* src/devices/grolbp/lbp.h (lbpputc): Use `unsigned char' for
argument.

* src/devices/grotty/tty.cpp (tty_printer::make_rgb_string): Use
cast for integer constant.

* src/preproc/html/pre-html.cpp (image_device): Use `const'.
(writeNbytes): Add `const' to first argument.
(writeString): Add `const' to argument.
(char_buffer::can_see): Add `const' to third argument.
* src/preproc/html/pushback.cpp (pushBackBuffer::isString): Add
`const' to argument.
* src/preproc/html/pushback.h: Updated.

* src/preproc/soelim/soelim.cpp (include_list): Add `const'.
(include_path_append): Add `const' to argument.
(do_file): Updated.

* src/roff/troff/uniglyph.cpp (unicode_to_glyph_list): Use `const'
for `value'.
(unicode_to_glyph_init::unicode_to_glyph_init): Updated.
* src/roff/troff/uniuni.cpp (unicode_decompose_list): Use `const'
for `value'.
(unicode_decompose_init::unicode_decompose_init): Updated.
* src/roff/troff/glyphuni.cpp (glyph_to_unicode_list): Use `const'
for `value'.
(glyph_to_unicode_init::glyph_to_unicode_init): Updated.
* src/roff/troff/input.cc (process_startup_file): Add `const' to
argument.