Werk #7992: Add DATE_YEAR, DATE_MONTH, DATE_DAY report scheduler macros

Component	Reporting & availability
Title	Add DATE_YEAR, DATE_MONTH, DATE_DAY report scheduler macros
Date	Jul 29, 2019
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Pro, Checkmk Ultimate MT 1.6.0b5 Checkmk Pro, Checkmk Ultimate MT

These macros can now be used e.g. in the names of the generated PDF report files when storing them locally on the Checkmk server.

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