Cleanup histogram data usage

Touches some 'obvious' cases where histograms were misused.

- Replace copies by references to x, y and e histogram data
- Use setSharedX, setSharedY, setSharedE instead of manually copying the
values
- std::move vector data to histograms
- Fix off-by-one errors in SaveReflThreeColumnAsciiTest,
SaveReflCustomAsciiTest, SaveANSTOAsciiTest and ISISEnergyTransfer
- Fix issues in RefAxisTest

Re #24462