Add Install section to systemd service

Bump version to 2.0.3

Bump version to 2.0.2

Bump version to 2.0.1

Bump version to 2.0

Bump version to 2.0.rc1

data: Do not translate polkit vendor

polkit does not support this and outputs warnings about unrecognised
<vendor> elements in the .policy file.

Closes blueman-project#212

Prepare release 1.99.alpha1