Moved the includes for Lua headers to the .cc files so they are
not needlessly, repeatedly included.
Similarly, moved some standard headers to the .cc files and reorganized
includes to be uniform for all nse_* source files.
Fixed whitespace (removed tabs).
Now does most of it's work through Lua:
From Nmap-dev: "Many of the changes consist of changing how Nmap interfaces
with Lua that were sometimes awkward or inflexible. Most of the functions
have been made to be callable directly by Lua which offers many technical
advantages: stack management is alleviated, errors are handled cleanly and
are more descriptive, and there is increased reusability."
Additionally:
-- Moved all lua_State * symbols from "l" to "L". This is to maintain
consistency with other Lua libraries (convention) and to make our macros portable.
-- Moved file system manipulation over to nse_fs.cc (from nse_init.cc)
