1.5 - corrected problem when setting dates towards the end of long months (eg setting a holiday date in Feb if today's date is 31 January)
1.4 - fixed bug which prevented negative hours (or fraction of hours) from being entered. Simplified layout
1.3 - Enabled for Android 1.6 and above.
1.2 - Permanent fix for crash when database is empty (initial install or if all records deleted).