sys/transcevier: fix more loop integers
native: clean up and clarify help

- reorder option details to mirror the order given in usage
- list option arguments in option details
- clarify option arguments
Merge pull request #1459 from LudwigOrtmann/native_help

native: clean up and clarify help
Fix a few cppcheck findings
Merge pull request #1472 from LudwigOrtmann/cpp-check-a-bit

Fix a few cppcheck findings
native: uart reconnect buffer replay

When using socket stdio, add option to replay what has been written to
stdout while not connected (`-r`).

The implementation is to simply use the existing log file (which is
implicitly created when the option is used), and read from it until
EOF upon reconnect.

closes #476
native: cleanup

fix style
fix some syscall declarations
reorder syscall declarations
init syscalls in dedicated function
substitute 1 with EXIT_FAILURE
Merge pull request #1445 from LudwigOrtmann/issue-476

native: uart reconnect buffer replay (+a little cleanup)
Merge pull request #1403 from LudwigOrtmann/transceiver_fixup

sys/transcevier: fix more loop integers
sys: Initial import of a general interface to a network protocol
sys: net: Initial import of a dummy MAC protocol layer
sys: transceiver: Provide an adapter to basic_net module

Since basic_net is aimed to replace tranceiver one day, but porting
efforts usally take a while, this commit aims to provide access via
transceiver as we are used to for radio/network drivers that already implement
basic_net (e. g. uart_net in #1454).
nativenet: Prepare for dummy_mac compatibility
[WIP] Add tests for dummy_mac (+ basic_net)