Make output of @#echomacrovars directive more user friendly

1. Return an alphabetical list instead of one in declaration order The current version is very hard to parse for large models.
2. Provide line number in command window instead of just Macro Variables: (as is the case with the save option when saving to options_). Currently, multiple calls are indistinguishable in the output.

Regarding your point 1: as far as I can tell, the list of macro variables is already in alphabetical order. Do you have a counter-example?

Yes: MWE2.mod returns, among others

Macro Variables: 
  BB_reply_preferences = 1 
  CPI_Taylor = 0 
  EZ = 1 
  G_shock = 0 
  Rotemberg_pricing = 1 
  TFP_uncertainty = 0 
  allow_level_shocks = 0 

The last one starting with a is not first.

Well, it is in alphabetical order, if you consider case sensitivity.

I see. Can we make is case insensitive?

Done in f9e91d33

mentioned in commit f9e91d33

closed with commit 42c12629

assigned to @sebastien

changed milestone to %7.x

added enhancement macroprocessor labels

mentioned in commit 42c12629