workLogHelper

Adds a worklog to the worklogs list

• Startdate is a date formatted 'yyyy/MM/dd'
• timeSpent is a pretty formatted duration such as '1w 2d 3h 4m'

Returns a list of workLogs, visible for all users.

mergeNewWorkLogs merges the differences between orignal worklogs
and newWorklogs into the resulting worklogs

merges the worklogs from two sides:

• adds the added remote worklogs
• removes the removed
• changes the changed ones.

mergeWorkLogs does not touch any of the worklogs that exist only locally (were not synchronized yet / are filtered out from synchronization)

Merges the worklogs from two sides and allows adjusting details of every synced workLog.

Use a closure function to define how the workLogs should behave.