Improved PPP package for v6.x

[honzam]

For some while now we have been working on new PPP package for RouterOS. Main goal was to improve
speed and stability. Package was tested in our internal networks and by some our dev build testers.
Speed and stability improvements apply for multicore devices only.

Note:
- we will appreciate reports for new ppp package to support@mikrotik.com
- package should not be used at production environment;
- v6.7rc PPP changes will be included 6.8 or v6.9 release (not at 6.7 web release).

Development build download links:
http://www.mikrotik.com/download/share/ ... 6.7rc2.npk
http://www.mikrotik.com/download/share/ ... 6.7rc2.npk
http://www.mikrotik.com/download/share/ ... 6.7rc2.npk
http://www.mikrotik.com/download/share/ ... 6.7rc2.npk

ppp-v7 packages:
http://www.mikrotik.com/download/share/ ... c2-ppc.npk
http://www.mikrotik.com/download/share/ ... 2-tile.npk
http://www.mikrotik.com/download/share/ ... mipsbe.npk

ppp_v7 package improvements consist of 2 parts:
*) ppp_v7 package should provide additional improvement in PPPOE, PPTP and L2TP interface management.
*) upgrades in the drivers and Kernel, that should deliver improvement in traffic throughput performance on those interfaces.

Improvements will be seen on all supported architectures, but highest performance improvements will be seen especially on multicore systems