replace AllProcessors with AllProcessors2

old (C++) AllProcessors was removed
AllProcessors2 (Lua) was renamed to AllProcessors
README/PostProcessing/genes
fix crash Sequence.push_back("") (on empty seq)

add test against this crash
debug mode: use lua_call instead of lua_pcall

However this change is not sufficient to
prevent Lua from "catching" C++ exceptions
(turning them into Lua PANIC).