was unable to recognize structure markers `&'.

book style.

Please look at this version and tell me your opinion. Especially I don't feel
happy about the spacing and (not) indenting of paragraphs.

Also, I've removed things like "fax" and "letter" from the LaTeX mapping file.

Protocol hooks deserve an extra chapter (to come soon).

to use ea_find() directly.

show ospf neighbors now knows "<interface>".

(1) obsolete and (2) replaced by the progdoc.