Patch set for ELKS kernel

Hi,

I will send a set of 5 patches aimed to:

   -Improve readability of kernel code,

   -Fix a potential problem with the preservation of some
    registers after a fork system call.

   -General optimization of code: removing unused functions
    and variables, place in single functions sequences of
    code repeated at several places in the source tree and
    simplifying code.

   -Reduce both code and data size.

   -Reduce amount of assembly code.

No improvement is "bcc specific".

 Patches should be applied in the correct order: starting with
elks-2a.patch and ending with elks-2e.patch

 All Images builded without errors. Every Image was tested
with QEMU emulator.

Greetings,

Juan