roff underline+bold not recognized

[egmont]

I've just found that the \f4 macro in chacl.1 turns on underlined and bold at the same time, and is displayed by "less" accordingly.

The *roff pipeline translates an underlined+bold character into:

underscore backspace letter backspace letter

Both the viewer and the search engine should be updated to recognize this.

[egmont]

Fix

[egmont]

Fix attached.

TODO:

• test
• update manpage/help/docs
• the hex viewer has some color collision, see whether the new color could become handy there.