Summary

• This is a…
  • Bug fix
  • Feature addition
  • Refactoring
  • Minor / simple change (like a typo)
  • Other
• Describe this change in 1-2 sentences:

Set default paths to standard locations

Problem

Default paths are quite unpredictable, for example, the "Move files to" points to current directory (.) which leads to unexpected behaviour if not changed before moving files.
Picard behaviour is different from most apps in this regard.

Solution

Since Qt5.0, QStandardPaths provide standard locations for all systems, use it.

Action