Add stub hashes to append-subcategories function
Add stub hashes to append-subcategories function

This is to keep the compiler happy while testing the method of the same
name.  This function will disappear in the future.

perl6/perl6-examples,Quinny/perl6-examples,perl6/perl6-examples,stmuk/perl6-examples,stmuk/perl6-examples,Quinny/perl6-examples,shlomif/perl6-examples,Quinny/perl6-examples,Quinny/perl6-examples,stmuk/perl6-examples,shlomif/perl6-examples,stmuk/perl6-examples,perl6/perl6-examples,shlomif/perl6-examples,perl6/perl6-examples,stmuk/perl6-examples,shlomif/perl6-examples,Quinny/perl6-examples,perl6/perl6-examples,shlomif/perl6-examples