Remove sgi_termlength:wide

This fixes the build on recent publican versions
Also build the books in html format
Remove sgi_termlength conditionals that brake the build

A few conditionals brake the build because id's defined under
the conditional are referred to without using the conditional
expression.

pcp-users-and-administrators-guide.xml:6987: validity error : IDREF attribute linkend references an unknown ID "IG31371888141"
pcp-users-and-administrators-guide.xml:6987: validity error : IDREF attribute linkend references an unknown ID "IG31371888147"