[error] error_trace* with custom message

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[lib] soversion for libcor and libcor-udev

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
lists comparison and dumping can be used in different tests

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[mt] Completion to hold thread until counter is 0

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[mt] TaskQueue to execute tasks in single thread

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
Merge pull request #3 from deztructor/master

TaskQueue, Completion and friends