SD2 update
[12351] Add some creature_template level checks to avoid client crashes with invalid values

(based on commit [12367] - eadfd08c374fa77ac6a6c4ecbc113755cfb83a7f)

Conflicts:
	src/game/ObjectMgr.cpp
	src/shared/revision_nr.h
[12352] use the absolut path for CMAKE_INSTALL_PREFIX

Before this commit, building with a relative ${PREFIX} would cause the
build to fail.
[12355] Some code cleanup

Conflicts:
	src/game/Calendar.h
	src/shared/revision_nr.h
[12359] Fix spell 24834

Also thanks to nighoo for an (independend) alternate version that was also important for final form.
Close #63

Signed-off-by: Schmoozerd <schmoozerd@cmangos>

Conflicts:
	src/game/SpellAuras.cpp
	src/shared/revision_nr.h
[mr2693] use default SQL storage for spell_script_target (from Schmoozerd)