* database confirm method in different threads, maximum 5 seconds /each check
* close current db connection when error take place.

branch "SMARTLINK" is continous be ok for smartlink project

Delete some fields in message defs, make master branch a "example" branch for study , also as a template for other new branches.

It is very strange, that in GNU C++ in Ubuntu, inline-member funcs called by different thread will return zero values.