projman #18197 "save project as ..." should write all files [open]

"save project as ..." should write all files: currently it saves only the project_tasks.xml. Probably, it should (be possible to) save all the project in a new folder. We will have to care about modifications all over the project: Resources, Project filenames ...

prioritynormal
typeenhancement
done in0.17.0
load1.000
load left1.000
closed by<not specified>