Import, fix surrogate characters in text filenames

Pre-process source file names to manage surrogate characters or not valid characters (ex: | with Windows).

Solution : replace 2 octets chars with one or transliterate

changed milestone to %TXM 0.8.4

added import label

marked this issue as related to #1313 (closed)

changed title from Import, fix surrogate charactesr in text filenames to Import, fix surrogate characters in text filenames

changed the description

changed the description

changed milestone to %TXM 0.8.5