First re-working using Custom Post Types etc.
Prevent plugin auto update (for the moment).
Added [discography_songs] shortcode.
Fixed post_type warning.
Add install Posts 2 Posts meta box to album and song edit pages.
Updated styles - hopefully these will look better by default in themes.
Allow more strings to be translatable.
More strings for translation.
Rename options page function.
Allow <em>, <strong> and <small> in lyrics field.
Separate admin hooks and filters.
Set default category option values only if $term set.
Only run datepicker JavaScript if elements exist.
Fix styling table cell widths.
Add category, song and album columns on edit screens.
Add download and streaming columns.
Ignore .DS_Store
Substitute some nicer icons.
Flush rewrite rules when setting page visited. Would be better to do on save?
Use filter_get_post_meta to set default options.