configuration updater

forced update dialog
check for updates button
check address when downloading bundles

src/slic3r/Config/Version.cpp

@@ -66,6 +66,10 @@ bool Version::is_current_slic3r_supported() const
 	return this->is_slic3r_supported(Slic3r::SEMVER);
 }
 
+bool Version::is_current_slic3r_downgrade() const
+{
+	return Slic3r::SEMVER < min_slic3r_version;
+}
 #if 0
 //TODO: This test should be moved to a unit test, once we have C++ unit tests in place.
 static int version_test()

src/slic3r/Config/Version.hpp

@@ -29,6 +29,7 @@ struct Version
 
 	bool 		is_slic3r_supported(const Semver &slicer_version) const;
 	bool 		is_current_slic3r_supported() const;
+	bool 		is_current_slic3r_downgrade() const;
 };
 
 // Index of vendor specific config bundle versions and Slic3r compatibilities.