Explain how uidNumber are created

Based on the code uidNumber must be created at these lines

https://gitlab.fusiondirectory.org/fusiondirectory/fd-plugins/-/blob/1.4-dev/posix/personal/posix/class_posixAccount.inc#L913 https://gitlab.fusiondirectory.org/fusiondirectory/fd-plugins/-/blob/1.4-dev/posix/personal/posix/class_posixAccount.inc#L951

assigned to @bmortier

assigned to @jswaelens and unassigned @bmortier

changed milestone to %FusionDirectory 1.4

added PJ2003-0342 label

added plugin-posix label

added user-manual label

changed milestone to %FusionDirectory 1.6

created branch 183-explain-how-uidnumber-are-created to address this issue

changed time estimate to 2h