ccnl: dynamic memory - appserver module
ccnl: dynamic memory - control module
ccnl: dynamic memory - client module
Merge pull request #509 from mehlis/ccn-lite-follow-up-6

Ccn lite follow up 6: try to save as much static memory as possible
improve error messages when tap ioctls fail
change wording

addresses https://github.com/RIOT-OS/RIOT/pull/555#discussion_r9118361
Merge pull request #555 from LudwigOrtmann/tap_error

improve error messages when tap ioctls fail