chapters/exact: removed the remains of N_A
chapters/introduction: extended the BEC part slightly
macros: (A.S.) not using smallcaps for abbreviations
thesis: (P.D.) moved the list of publications to the front
thesis: added some comments about PDF/A
frontmatter: P.D. changes
chapters/introduction: P.D. changes
chapters/mm-wigner: P.D. fixes
chapters/wigner: P.D. fixes