getNextAlarm informs the period.pref_id
MainActivity can be opened directly setting a period
Touching the widget's text opens MainActivity to set the next period
Simpler way to directly set a period when lauching.
Simpler intents; Different PendingIntents avoid the same activity multiple times on back stack
Merge branch 'enhancement#21' into development
Logging only on degub
TimePickerFragment shows the current period label