Release 2018-04-19 for GNAT GPL 2017

• The performance of Timing_Events is improved.

• delay until Ada.Real_Time.Time_Last is supported.

• The restriction No_Recursion is removed (Ada_Drivers_Library uses it). It's still a good idea to include it where you can, possibly via a local configuration pragma: in your GPR's package Compiler,

    for Local_Configuration_Pragmas use "no_recursion.adc";

where of course no_recursion.adc contains

    pragma Restrictions (No_Recursion);

• All but 2k of free store is available for heap.