Added arduino-nano to BOARD_INSUFFICIENT_MEMORY/BOARD_BLACKLIST following suit
of how arduino-uno is marked, as arduino-nano is mostly an Uno in a different
form factor.
This test is intended to collect statistics about the runtime delays in
the periph_timer implementation. This tool is mainly intended to detect
problems in the low level driver implementation which can be difficult
to detect from higher level systems such as xtimer.
