[options] option to show "usage"

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[mt] correct BasicCondition, Future updates

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[notlisp] initialize Expr str member

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[mt] link cor with pthread

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>