Adapted FeynDiagram to let it run under Kubuntu 12. Manual not
generated any more.

Change-Id: I13ac81b537920fe2b8ac43697a55a09a2cd0bfd9
Added a diagram for a single photon (used as a symbol).

Change-Id: Idf92a66d775a1bcb5a0fa0a3c83cc6b34743b989
Updated preface and acknowledgements, corrected section "Quantum
Measurement"

Change-Id: I035d3964d616bb7feb38904faaa7210a7b712ea3