Various changes:

- New generic http_redirect function, and two shortcuts for 303: post_redirect and 301: perm_redirect
- Allow get_lib_file to take a default value, and change where master_template is set.
- Fix bugs in auth code and properly trim ^M from post data.
- Other cosmetic/minor improvements.

bin/werc.rc

@@ -4,15 +4,6 @@ cd ..
 
 forbidden_uri_chars='[^a-zA-Z0-9_+\-\/\.]'
 
-fn get_lib_file {
-    if(test -f $sitedir/_werc/lib/$1)
-        echo -n $sitedir/_werc/lib/$1
-    if not if(! ~ $#masterSite 0 && test -f $sitesdir/$masterSite/_werc/lib/$1)
-        echo -n $sitesdir/$masterSite/_werc/lib/$1
-    if not if(test -f lib/$1)
-        echo -n lib/$1
-}
-
 # Expected input: ls -F style, $sitedir/path/to/files/
 #          <ls -F+x><symlink hack><Useless?><hiden files  >
 dirfilter='s/\*$//; s,/+\./+,/,g; s,^\./,,; /\/[._][^\/]/d; /'^$forbidden_uri_chars^'/d; /^\/(robots|sitemap)\.txt$|\/index\.(md|html|txt|tpl)$/d; /_werc\/?$/d; '
@@ -132,19 +123,19 @@ fn run_handler { $*(1) $*(2-) }
 path=(. $PLAN9/bin ./bin/ /bin/ /usr/bin) 
 
 headers=lib/headers.tpl
-master_template=default_master.tpl
 res_tail='</body></html>'
 ll_add handlers_bar_left nav_tree
 werc_apps=( apps/* )
 werc_root=`{pwd}
+sitesdir=sites
 for(i in siteTitle siteSubTitle pageTitle extraHeaders)
     $i = ''
 
 # TODO: Per-req variables should move after initrc loading.
 site=$SERVER_NAME
 base_url=http://$site/
-sitesdir=sites
 sitedir=$sitesdir/$site
+master_template=`{get_lib_file default_master.tpl}
 current_date_time=`{date}
 
 . ./etc/initrc
@@ -219,7 +210,7 @@ if not
 setup_handlers
 
 if(! ~ $#debug 0)
-    dprint '  '$"SERVER_NAME^$"REQUEST_URI' - '$"HTTP_USER_AGENT' - '$"REQUEST_METHOD' - '$"handler_body_main
+    dprint '  '$"SERVER_NAME^$"REQUEST_URI' - '$"HTTP_USER_AGENT' - '$"REQUEST_METHOD' - '$"handler_body_main - $"master_template
 
-template $headers `{get_lib_file $master_template} | awk_buffer
+template $headers $master_template | awk_buffer
 echo $res_tail