fmbtx11: optimized screenshots, use fmbtpng/libpng

- Removes xwd / x11-apps dependency.
- Fixes a bug (leaving *.xwd files behind).
- Roughly doubles refreshScreenshot() speed.
fmbt-editor, fmbt-scripter: save unsaved work dialog
fmbtandroid: fix monkey launch
fmbttizen: more helpful connection error message
tests: fmbt-trace-share needed more time to die

On some platforms, 0.5 sec was not enough for
fmbt-trace-share to commit suicide when nobody asked it
to do so.
Merge remote-tracking branch '01/devel' into for-devel
fmbtandroid: fixed monkey unknown option support
Version 0.16.2
Merge remote-tracking branch '01/devel' into for-devel