Android: add listeners on options changed

contrib/mobile/Android/src/org/geuz/onelab/MainActivity.java

...rib/mobile/Android/src/org/geuz/onelab/ModelFragment.java

...e/Android/src/org/geuz/onelab/OptionsDisplayFragment.java

...b/mobile/Android/src/org/geuz/onelab/OptionsFragment.java

...ile/Android/src/org/geuz/onelab/OptionsModelFragment.java

...id/src/org/geuz/onelab/OptionsPostProcessingFragment.java

contrib/mobile/Android/src/org/geuz/onelab/Parameter.java

...b/mobile/Android/src/org/geuz/onelab/ParameterNumber.java

...b/mobile/Android/src/org/geuz/onelab/ParameterString.java