Audacity 1.3.11 Beta

# Bug fixes for:

* Imports and Exports:
- Bug when exporting partial selections caused too much audio to be exported is fixed
- Fix corrupt files exported through FFmpeg when metadata included (metadata is now exported correctly in M4A files)
- Prevent saving a new Audacity Project over an existing one as this could corrupt both projects
- Improved help for files that cannot be imported because the relevant optional library is missing

* Effects:
- Allow effects which change the length of the audio they work on to also be applied to selected label tracks, thus keeping them synchronized
- Fixed inability in Nyquist plug-ins to add labels to an existing label track
- (Mac) Equalization window was corrupted after Preview
- (Linux 64-bit) Fixed crash Generating Click Track

* Audio Devices:
- Fixed bug causing recording to stop short when the recording sample rate is not supported by the sound device and libsamplerate is used for resampling
- Fix crash when opening Preferences on a machine where there are no available audio devices
- Fixes for bugs using Timer Record and Sound Activated Recording

* User Interface:
- Sizes of some dialogs adjusted to ensure they fit on the screen
- Fix for supposedly "hidden" items appearing on screen with large monitors
- Various keyboard shortcut and translation fixes

* Other bug fixes:
- Several timing-dependent crashes and minor incorrect behaviours have been fixed
- Windows installer now installs correctly over previous versions of Audacity

# Changes and improvements:
- (Windows) Better icon file with higher resolution and transparency
- New SoundFinder plug-in to label regions of audio between silences, so allowing silences between tracks to be excluded when exporting multiple