Add 'show software keyboard' button to panel

+ add button that tries to show florence screen keyboard
+ florence xpm icon
+ polish translation updated
Make szbpush less io intensive

* using --append-verify option for *.szb synchornization
prevents revriting of each file on every update
Merge branch 'master' of github.com:Newterm/szarp
Merge branch 'master' into devel

* Last master changes to devel