Re #10123. Saving float and other numeric types.
Re #10123. Tests for saving numeric columns.
Re #10123. Saving and loading numeric columns.
Re #10123. Save and load V3D columns.
Re #10123. Removed unused variable.
Re #10123. Fix compiler warnings.
Re #10123. Use only fixed size ints in table columns.
Re #10123. Temporarily revert changes that break tests.
Re #10123. Renamed column type names.
Re #10123. Missed some size_t references in table columns.
Re #10123. Returned size_t to the column types.

size_t is converted to uint64_t on saving to nexus.
Re #10123. Fixing CheckWorkspaceMatchTest
Re #10123. Test for saving string columns.
Merge remote-tracking branch 'origin/bugfix/10123_save_float_column'