Factor SCSH-ERRORS out of SCSH-LEVEL-0.

scsh/scsh-package.scm

@@ -86,6 +86,11 @@
   (open scheme)
   (files scsh-version))
 
+(define-structure scsh-errors scsh-errors-interface
+  (open scheme
+	handle conditions signals)
+  (files scsh-condition))
+
 (define-structure partial-s48-ports
   (export current-input-port current-output-port
 	  newline
@@ -209,7 +214,9 @@
 	command-levels
 	features
 	general-tables
-	simple-syntax)  
+	simple-syntax
+
+	scsh-errors)  
   (for-syntax (open scsh-syntax-helpers scheme))
   (access interrupts
 	  sort
@@ -226,7 +233,6 @@
 ;	 select
 	 fname
 	 stringcoll
-	 scsh-condition
 	 rw
 	 newports
 	 fdports