Crosswords for handhelds SVN

Change board_zoom to indicate direction only of zoom, not number of
cols. When figuring internal dimensions zoom out as needed to meet
maxSize value. This fixes problem where rotating a zoomed portrait
board to landscape leaves cells bigger than they can be made by
zooming, but then the desired zoom has been changed and stored and so
on return to portrait cells are smaller/less zoomed. Need to see if I
can live with that.

add Retry button to dialog announcing client failure to find expected
room on relay. From handler call new comms_resetSame and existing
code to init client game connecion.

export comms_resetSame through jni

add comms_resetSame that resets relay with existing params.

change api for board_zoom and change callers. No effect on java and
no behavior change.

use same logic to decide to zoom and to report whether can zoom next
time. Fixes bug preventing + button from greying out when fully
zoomed in.

quick hack to enable/disable zoom buttons so can debug board.c w/out
android.

oops. Fix assertion by not stopping dragging unless it's been
started.

stop dragging before putting up miniwindow. This allows to drag
finger off of bonus hint just displayed without scrolling the screen.

move System.loadLibrary("xwjni"); to XwJNI.java which is certain to
always be loaded before any jni call is made. Fixes -- I hope --
occasional UnsatisfiedLinkError happening on-device.