The libpe submodule now refers to the mmap branch.
- The Makefile now uses GNU conventions [1].
- Need to to fix the install rule on Linux.

[1] The GNU coding standards, March 8, 2013.
    http://www.gnu.org/prep/standards/html_node/Makefile-Conventions.html
Adapt pesec for the new libpe.
Functions with no parameters should have a `void` on its parameter list.
Fix stack cookies. Revert changes made in 638a078 and re-adapt.
started pescan conversion, only the new cpl analysis is working
pescan: Adapt entropy calculation for the new libpe.
pescan: Fix array type.
added detection for undocumented FPU instructions use (anti-disassembly)
added detection for undocumented FPU instructions use (anti-disassembly)
fixed conflicts  and variables scopes
Update libpe reference.