start on info manual

Signed-off-by: Mattias Andrée <maandree@operamail.com>
overview and invoking

Signed-off-by: Mattias Andrée <maandree@operamail.com>
ignore $PAGER if it is an empty string

Signed-off-by: Mattias Andrée <maandree@operamail.com>
doc environment

Signed-off-by: Mattias Andrée <maandree@operamail.com>
m

Signed-off-by: Mattias Andrée <maandree@operamail.com>
info: interface

Signed-off-by: Mattias Andrée <maandree@operamail.com>
typo

Signed-off-by: Mattias Andrée <maandree@operamail.com>