picard-plugins: Use install instead of cp and mkdir.

Per gtmanfred's comment on the AUR page.
picard-plugins: pkgrel++
picard-plugins: cleanup + fix lastfm(non-plus)
picard-plugins-lastfmplus now in picard-plugins
python2-rtslib: update dependendy names
addon-sdk-stab: 1.14rc1
addon-sdk-stab: 1.14rc2
addon-sdk: 1.14
isrcsubmit1: create as 1.0.1
isrcsubmit: 1.0.1
python-musicbraizngs: copy from python2-musicbrainzngs
python-musicbrainzngs: fix for Python 3
apt: 0.9.7.8
python2-apt: 0.8.8.2
picard-plugins: 1.2, remove coverart.py

Cover art handling is now included in picard directly.
isrcsubmit: 2.0.0-beta.1