#9 Add default file name for 'Save'

[Tony Williams]

Add default file name for 'Save'

It would be good if the default file name that came up
when you select 'Save' for the first time on a new post
was better than 'Untitled 6'.

How about taking the first 32 letters of the first line
of the post (which is the post title) and replacing any
non-alpha chars and white space with '_' and offering
that. You might also fold multiple '_' into one and
lower case.

For example the text of this description would offer a
default name of

'add_default_file_name_for_save'