Automatically remove dups in `$(USEMODULE)`
ccnl: remove useless config module
ARM: fix several warnings
fixed warnings on Wformat
initialized `j` with 0
Merge pull request #1088 from mehlis/arm-warnings

ARM: fix several warnings
fixed Wformat warning
Merge pull request #1089 from BytesGalore/fix_test_cooperation_warnings

test:test_thread_cooperation fixed warnings on Wformat
ccnl: extra debug statements
Merge pull request #1090 from BytesGalore/fix_use_uninitialized_variable_warning

test:test_irq initialized `j` with 0
fixed Wformat warnings
Merge pull request #1091 from BytesGalore/fix_print_format_warning

test:test_pthread_barrier fixed Wformat warning
fix re-added removed printf formatter
Merge pull request #1096 from BytesGalore/fix_removed_formatter

test:test_pthread_barrier re-added removed printf formatter
Merge pull request #801 from Kijewski/makefile-no-usemodule-dups

Make: Automatically remove dups in `$(USEMODULE)`
sys: rename ringbuffer functions

Closes #1011.
shell: added RPL route shell command
Merge pull request #1092 from BytesGalore/fix_print_format_warnings_test_thread_msg

test:test_thread_msg fixed Wformat warnings
core: documentation: updated, improved, and completed doxygen comments
core: documentation: fixed bitarithm documentation