fmbtandroid/fmbttizen/fmbtx11: default opacityLimit changed (backward compabilty break)

The default opacityLimit is changed to 0.0, that is, possible alpha
channel of verified bitmaps is ignored. This makes the API consistent
(by default, always require perfect match for maximal
reliability). *Bitmap methods that currently use alpha channel for
ignoring comparison of some areas of must add explicit
opacityLimit=.95 optional argument.
fmbttizen: setDisplayBacklightTime() added
fmbtgti: enableVisualLog allows only one log per filename
fmbtx11: use libX11.so.6 instead of libX11.so
fmbttizen: multitouch support added

pinch/pinchBitmap/pinchOpen/pinchClose added to the Device interface.
fmbttizen: fix setDisplayBacklightTime return value
gitignore update
fmbtandroid/fmbttizen/fmbtx11: swipe* methods improved

- direction can be given as degrees, in addition to
  north/south/east/west.

- optional distance parameter added to adjust gesture distance on the
  screen. The default is 1.0: swipe to the edge.
fmbtgti: wait* function documentation made more exact
fmbttizen: distance scaling in pinch* methods made easier to understand

pinchOpen and pinchClose defaults changed: now the gesture ends to
(pinchOpen) or starts from (pinchClose) from half of the distance
between the gesture central point and the edge of the screen (in
finger's movement direction). Screen edge is always reached if
distance is set to 0.5.
fmbt.py: fmbt.setAdapterLogWriter has now effect even without remote_pyaal/remote_python
fmbttizen: fixed pressVolumeUp() and pressVolumeDown()
Version 0.9.4