Adding rules and Tyrannocyte options for Hierodules

Adding rules description and Tyrannocyte options for Hierodules
Added dataslate rules + bugfix

Added rule descriptions for the three dataslates and fixed bug #542 from
BSData/wh40k (Hit and run missing from manufactorum genestealer
formation)
Merge pull request #547 from arnestig/master

Adding rules and Tyrannocyte options for Hierodules