Adding binop template description to concrete/
preparing concrete section about binop function templates
Adapted binary assignment operator text
WIP
Added new tests to 'build examples'
Adding 'build examples' facility to check the compilability of the examples
Changed all 'T const &&' params into 'T &&', 'const operator' into 'operator'
updated the images
Completed the swap/operator= discussion
Rewriting sections about swapping