Author: Tim Hunt
MDL-27418 add validation to stop students intering a thosands sep.
If it might be confused by a decimal point from another locale.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=f040d4b0462844b2d47387eb48d73c3b7dc84825
http://github.com/moodle/moodle/commit/f040d4b0462844b2d47387eb48d73c3b7dc84825
+ 2.1 en [pleaseenteranswerwithoutthousandssep,qtype_numerical]