[O] Headlines with slashes when refiling

[Sebastian Reuße]

BTW this reminds me of some issues I ran into on master a while 
back. When a refile target has a headline containing a slash, 
there are some issues:

1. When an existing headline contains a slash, completing-read 
will display the target as »A\/Slash«. However, when entering the 
string manually, it must be input as »A\\/Slash«.

2. It’s not possible to refile under a newly created node when the 
new headline contains a slash, since there is no way to escape 
them.

I’ll go and look into 2 when I find some extra time. This might 
involve some awkwardness, since we don’t have regex 
look-ahead/behind in Emacs.

Kind regards,

S.

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