qreadm /qload: First extracted object must be renamed (minor bug)

[MarkAPitt]

Given: qs::qsavem(o1, o2, file="two_objects.qs")

qs::qreadm(file="two_objects.qs") will create "qs::o1" and "o2"
In other words, exists("o1") is FALSE. but exits('qs::o1") is TRUE