Password is overwritten when uploading a user a second time.

For exemple, assume "JamesBond" is enrolled for the first time (in course1 = C1). The file to upload is:

username, password, firstname, lastname, email, course1, group1
JamesBond, secret, James, Bond, email@mi5.com, C1, G1

JamesBond decides then to change is password to "topsecret".

Next "JameBond" is enrolled in course2 = C2:

username, password, firstname, lastname, email, course1, group1
JamesBond, secret, James, Bond, email@mi5.com, C2, G2

The actual password is then again "secret" (i.e. not "topsecret") which is quite embarassing.

I have tried with all possible parameters (the parameter "Update existing accounts =Yes" is neccessary for the enrollment in the course but then the password is overwritten; I have also tried "Allow renames=No").