Meta issue to keep track of broken examples

[rht]

• cce. Broken because flexx API has been updated. https://github.com/AB-CE/abce/issues/203
• monetary_shocks. Broken with assertion errors
• pid_controller/analytical. Broken because of flexx API. same as cce
• pid_controller/full_pi_controlled. Broken because AttributeError: module 'abcEconomics' has no attribute 'Quote'. Blame https://github.com/AB-CE/abce/commit/b53cbedff1b5d0624b0367755a8c9f315afe8f9e
• pid_controller/simple_seller_example. Broken because AttributeError: module 'abcEconomics' has no attribute 'Quote'. Blame https://github.com/AB-CE/abce/commit/b53cbedff1b5d0624b0367755a8c9f315afe8f9e
• sugarscape. Broken because

  File "start.py", line 47, in main
  print(',', len(agents.trade_with_neighbors()))
  TypeError: object of type 'Chain' has no len()

[rht]

@DavoudTaghawiNejad it turns out that Quote is used in 2 examples, see above. Should https://github.com/AB-CE/abce/commit/b53cbedff1b5d0624b0367755a8c9f315afe8f9e be reverted?