Error handling CSV with space after a comma.

[drpowell]

eg. this column header is a problem:

Gene ID, name, control rep1, control rep2, treatment A rep1, treatment A rep2, EC Number

but this is ok:

Gene ID,name,control rep1,control rep2,treatment A rep1,treatment A rep2,EC Number

Issue is that R ignores the leading space in column header when loading, but not when doing a column lookup.

[drpowell]

(First raised here : #45)