#11 Rename attachments/images objects based on title

[Anonymous]

I see that somebody requested this feature already in
this forum. Also I feel that having a random id for the
objects (attachments and images) contained in
PloneArticle doesn't make it easy for them to be reused
and referenced from elsewhere, for example inside the
article source text as <img src="./image_name")/>.

I believe that they should be renamed based on the title
that the user give them in the PloneArticle interface.

Just my two cents... keep up with the very good work!!!