Show hint when Soul Reaper does bonus shadow damage to target.
Improved the content of the tooltips in configuration mode.
Common: ignore dead group members in the count of missing raid buffs.
Common: improved the description of the raid buff rule.

Fixes GH-34.
Config: added an option to select how to display the suggestions.

Closes GH-38.
Updated the localization.
Whenever possible, append a reference to the source in the description of the rule.

LPS-<class>-<patch>-<revision>: LibPlayerSpells-1.0.
DR-<minor>: DRData-1.0.
LSB-<minor>: LibSpellbook-1.0.
LD-<minor>: LibDispellable-1.0.
Docs updated.
Fixed GH-37.