Changed ws api, joined GetProblemsFromSting and GetProblemsById into GetProblems
Added a list of objects from relations into GetProblems
Added a getObjectsByIds operation into DataProvider
Changed logging in web service layer
Client adapted to changes in ws layer
Merge branch 'server-impl'
Removed exception IdNotFound from getProblems operation
More descriptive problems on document saving implemented in client
New relations in Errors Window are displayed in a TreeView