E2guardian first v4 Stable Release

This is first stable release of E2Guardian V4.

Only required bug and security fixes will be applied in the v4.1.x point releases.

V4 is written in C++11 and uses threads, in order to make e2guardian scaleable to very large systems.

This version (v4.0 dev & v4.1 stable) is largely backward compatible with v3 configuration files.

Testing is showing an increase in speed and a big reduction in memory usage, as well as almost instant list reload with no interruption to service.

A big thanks to everyone who has contributed to getting this new release production-ready in such a short time.

Please see notes/NEWIN_v4 for details, and before trying to configure or compile.