Quick cleanup
Added suppressions back
Merge pull request #763 from lexware/master

Quick cleanup
WIP: Add proper installation location checking

 * Moved installation location checking from InstallDirectoryDialog.java
   to new file.

 * minor edits
   * ChooseDir.java: use logDebug
   * InstallDirectoryDialog.java: removed focuslistener and do not allow
   use x to close dialog => full control for installation path saving
WIP:

 * LaunchFrame.java: document & todo
 * CheckInstallPath.java: new test
 * InstallDirectoryDialog.java, OptionsPane.java: TODOs for fixes