new global gDirs for default directories and filters; rm warnings from file loaders

standardize file save dialogs

disentangle ProjectManager from new src pair Dirs

rm all handling of warnings; just throw a runtime_error if something fails. This saves us lots of compilcations.

GUI/Model/Job/JobsSet.cpp

@@ -88,7 +88,7 @@ void JobsSet::readFrom(QXmlStreamReader* r)
 
 void JobsSet::saveAllDatafields(const QString& projectDir) const
 {
-    for (const auto* job : *this)
+    for (const JobItem* job : *this)
         job->saveDatafields(projectDir);
 
     dataFilesCleaner.cleanOldFiles(projectDir, dataItems());
@@ -96,7 +96,7 @@ void JobsSet::saveAllDatafields(const QString& projectDir) const
 
 void JobsSet::loadAllDatafields(const QString& projectDir, MessageService* messageService)
 {
-    for (auto* job : *this)
+    for (JobItem* job : *this)
         job->loadDatafields(projectDir, messageService);
 
     dataFilesCleaner.recollectDataNames(dataItems());