** printfile - print html header/footer file and fill in values 
**             substituting for magic cookies. Return allocated
**             memory with the header/footer filled in.
**
**      Substitution cookies supported
**
**              %% - '%' character
**              %~ - storage directory
**              %a - Other Archives URL
**              %b - About Archive URL
**              %B - Body line specified
**              %e - email addr of message author - Not valid on index pages
**              %g - date and time archive generated
**              %h - HMURL
**              %i - Message-id - Not valid on index pages
**              %l - archive label
**              %m - Mailto address
**              %p - PROGNAME
**              %s - Subject of message or Index Title
**              %v - VERSION
**              %u - Expanded version link (HMURL,PROGNAME,VERSION)
**              %S - Subject META TAG - Not valid on index pages
**              %A - Author META TAG - Not valid on index pages
**              \n - newline character
**              \t - tab character
**
*/

Proposed:
                %L - Listname : specifies the name of the list being archived. 
                                This is a convienent variable to have defined 
                                as it can be used as a cookie or environmental
                                variable in documentation references.

                %H - Hostname : The hostname you want added to a mail address  
                                appearing in the RFC822 field which lack a
                                hostname. It is usefull on the command line 
                                when servicing virtual hosts. 

** expand_path - fill in values substituting for magic cookies
**
**      Substitution cookies supported
**
**              %d - two digit day of month (1-28/30/31)
**              %D - three letter day of the week
**              %m - two digit month of year (1-12)
**              %M - three letter month of year (Jan, Feb, ..., Dec)
**              %y - four digit year (1990,..2001)
**

