Improvements to resource capacity calculations

Previously, the SCV resource capacity calculation program calculated resource and resource unit capacities starting from the current day (system date). To support ongoing cycle periods, where the planning horizon start date is in the past, the program logic is improved to determine the capacity start date as follows:

• The program finds the minimum of start dates of all published planning calendars in SCV (in table SZ_SCP_CALENDAR).
• The program finds the minimum of the values of all model parameters with name CALENDAR_START_DATE.
  Note: The program determines the minimum of the above calculated valued as the final start date to use.
• If no published calendars exist in SCV or no model parameters are specified with the given name, the current day is used as the starting date.