fix bioc errors

- remove use of :::
- remove use of latex incompatible unicode

Author: grlloyd

R/struct_class.R

@@ -647,7 +647,7 @@ setMethod('.DollarNames','struct_class',.DollarNames.struct_class)
 setMethod(f = 'as.code',
     signature = c('struct_class'),
     definition = function(M,start = 'M = ',mode = 'compact',quiet=FALSE) {
-        str=struct:::.as_code(M,start,mode)
+        str = .as_code(M,start,mode)
 
         if (!quiet) {
             cat(str)

R/zzz.R

@@ -31,7 +31,7 @@ get_description=function(id) {
             '@section ','Inheritance: ',
             paste0('A `', class(M),
                    '` object inherits the following `struct` classes: \\cr\\cr'),
-            paste0('`',i[1:w],'()`',collapse = ' \U2B62 '))
+            paste0('`[',i[1:w],']`',collapse = ' >> '))
 
 
     # citations