Load image fails for folder with special characters in folder name like ä or ü

[Wolfram Lyda]

Loading an image to itom via GUI which is located within a folder with special character in its name fails and the error message shows, that the special character is interpreted wrong.

[M. Gronle]

fixes issue #2: Qt5 fix: char -> QString, use QString::fromLatin1 since default from char to QString changed from latin1 to utf8 in Qt5

→ <<cset 76d38548b188>>