Port to kreport (and sometimes to kexi.git).
Keep authors. Mark each item as done using "[x]".
[ ] "Addition of user-scripting API docs for KoReport" 608d9b1a17048c078e9d1
[ ] 090fdccbe35a3a46c32
[ ] "Fixes for koreport maps plugin" 058a65f99b879a4
[ ] "Improve API: KoReportData::data() -> create()" aaac84665edc (also to kexi.git)
[ ] "Kexi Reports: Simplify the code" 501736da1cdf91 (also to kexi.git)
[ ] "Add KoReportPage dox" fcc2a503d4f65ecc9fc4
[ ] "Do not switch to Data View if fetching records failed, show clear message" 01983252eda (also to kexi.git)
[ ] "Use KoReportData as const when it's enough" 7289e60fdf1e6bf4 (also to kexi.git)
[ ] "make masterFields() and supportsSubQuery() const" 9d5d8f0db1afb (also to kexi.git)
[ ] "Fix retrieval of aggregate report values for queries" 80d0b9a4c7548ef (kexi.git)