The bare fix re #4464

Still to do: A check of constant number of columns in LoadAscii and Correct column headers and wiki in SaveAscii.

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Tidied up LoadAscii.cpp checked its format checks re #4464

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Merge branch 'feature/4464_ascii_xerror' into develop