update viking tower default structure  
fix up handling of empty flower pots in structure system
fix up handling of rotation of many meta-rotated TE blocks (furnaces
mostly)
add .76 release (public release of 2.3 branch)
rename instruction manual
fix issue of crashing when loading a biome with a null-name (seriously,
what modder is that incompetent?)
fix up labels for inventory side selection in worksite side-selection
GUI.  Closes #175
Merge branch '2.3'
add more libs/source for work on nei plugin
fix up sided inventory handling issues in worksites.  Closes #179.
fix up enchanting books in trading post enchanter trader.  Closes #176.
Merge branch 'master' into 2.4
update default town-pieces
update secondary test town template