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
[x] "Added additional docs for koreport scripting" 090fdccbe35a3a46c32
[ ] "Fixes for koreport maps plugin" 058a65f99b879a4
[x] "Improve API: KoReportData::data() -> create()" aaac84665edc (also to kexi.git)
[x ] "Kexi Reports: Simplify the code" 501736da1cdf91 (kexi.git only)
[x] "Add KoReportPage dox" fcc2a503d4f65ecc9fc4
[x] "Do not switch to Data View if fetching records failed, show clear message" 01983252eda (also to kexi.git) <---Kexi.git still todo
[x] "Use KoReportData as const when it's enough" 7289e60fdf1e6bf4 (also to kexi.git)
[x] "make masterFields() and supportsSubQuery() const" 9d5d8f0db1afb (also to kexi.git)
[ ] "Fix retrieval of aggregate report values for queries" 80d0b9a4c7548ef (kexi.git)
[x] "Further improve retrieval of aggregate report values for queries" 5ccac2b6b9218e9c5bc (also to kexi.git)
[x] "move ownership of KoReportData to real users: KoReportPreRenderer and KoReportDesigner" ef16eac3c2ae349 (also to kexi.git)