Merge branch 'prepare_v10r0' into 'master'

Add release notes

See merge request !328

ReleaseNotes/v10r0.md

+2021-02-23 - Urania v10r0
+===
+
+This version uses LCG 97a and it is part of a major cleanup campaign detailed on [DPA!57](https://gitlab.cern.ch/lhcb-dpa/project/-/issues/57). This version is released on `master` branch.
+Built relative to Urania [v9r0](../-/tags/v9r0), with the following changes:
+
+### Fixes ~"bug fix" ~workaround
+
+- Fix various problems reported by clang 10, !308 (@clemenci)
+- Include legacy changes for DeltaMS works, !307 (@cvazquez)
+- Add missing include of TObjString.h, !300 (@clemenci)
+
+### Code cleanups and changes to tests ~modernisation ~cleanup ~testing
+
+- ~Build | Remove OPTIONS "-U__MINGW32__" from gaudi_add_dictionary directive, !275 (@cattanem)
+- Add support for Python 3, !314 (@cvazquez)
+- Removal of CalibDataScripts and RooPhysFitter, !312 (@cvazquez)
+- Remove packages to be moved to Alexandria, !310 (@cvazquez)
+
+### Other
+
+- Add copyrights, LHCb formatting, and update documentation, !327 (@cvazquez)
+- Add ProbNNXnotYZ templates, !324 (@poluekt)
+- Drop cmake directory to use the modules from the LHCb user environment, !315 (@clemenci)
+- Masterkeep, !306 (@cvazquez)
+- Merge branch 'dev_kh_mergeoverview' into 'master', !303 (@cvazquez) [ROOT-10668]
+- Add e_ProbNNK, e_ProbNNpi and mu_ProbNNpi templates, !302 (@cvazquez)
+- LcfB does not need a narrow mass range, !293 (@vlisovsk)
+- Add muon NoPt data and MC templates, !292 (@poluekt)
+- Update GetWGPFilesDirac.py to point to new 2016 WGP files., !291 (@dhill)
+- Do not use xenv from LCG, !290 (@clemenci)
+- Added Lc_M cuts to IncLc and LcfB proton samples to align with sFit ranges., !289 (@dhill)
+- Update GetWGPFilesDirac.py to point to latest 2018 production from PIDCalibTuples9r2, !288 (@dhill)
+- Added new 2017 and 2018 Jpsinopt samples, !287 (@dhill)
+- PIDCalib trigger vars 2017, !286 (@dhill)
+- Moved DeltaMfit to correct directory, !281 (@dhill)
+- Pid calib delta m fit, !280 (@guwormse)
+- Add PIDe and ProbNNe to PIDCorr, !276 (@poluekt)
+- Pid calib delta m fit, !273 (@guwormse)
+- Update README.md to add instructions for using UraniaDev project, !272 (@cattanem)
+- Fixed cmake warnings in findTBB, !270 (@sponce)
+- Add p_ProbNNp_Mod2 template, !269 (@poluekt)
+- Add systematics in Run1, kinematic coverage info in PIDGen/PIDCorr, !268 (@poluekt)
+- Enable output specification and directory creation in PIDCalib, !266 (@mwilkins)
+- Merge request for BR(Lb2dsp) analysis, !265 (@jobutter)
+- Version 1 of tool to calc error due to calibration sample size, !194 (@ccostaso)
+