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By convention, all thread-related calls which implicitly affect
current and therefore do not take any @thread parameter should use a
short-form name, such as evl_delay(), evl_sleep(). For this reason,
the following renames took place:

- evl_set_thread_period -> evl_set_period
- evl_wait_thread_period -> evl_wait_period
- evl_delay_thread -> evl_delay

In addition, complete the set of kthread-specific calls which are
based on the inner thread interface (this one working for user and
kernel threads indifferently):

- evl_kthread_unblock
- evl_kthread_join
Signed-off-by: Philippe Gerum <rpm@xenomai.org>