Made --sort ..,<order> parameter optional (rev. 6_b1)

Signed-off-by: nixnodes <code@eth.si>
Implemented insertion sort (rev. 6_b2)

Signed-off-by: nixnodes <code@eth.si>
Signed-off-by: nixnodes <code@eth.si>
Signed-off-by: nixnodes <code@eth.si>
Made quicksort the default sorting algorithm (rev. 6_b3)

Signed-off-by: nixnodes <code@eth.si>
Implemented selection sort (rev. 6_b4)

Signed-off-by: nixnodes <code@eth.si>
optimize for performance, made existing record removal optional

Signed-off-by: nixnodes <code@eth.si>
add more info

Signed-off-by: nixnodes <code@eth.si>
2.4.6

Signed-off-by: nixnodes <code@eth.si>
Merge remote-tracking branch 'glutil/master' into stable