start_only_persistent alloc_f is now the default alloc

[jlnav]

Used to target develop. Now targets asktell-develop, with adjustments to the included regression tests.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.00%. Comparing base (ea9c35c) to head (221ad1b).

Additional details and impacted files

@@                            Coverage Diff                             @@
##           experimental/jlnav_plus_shuds_asktell    #1640       +/-   ##
==========================================================================
+ Coverage                                  47.66%   58.00%   +10.33%     
==========================================================================
  Files                                         80       80               
  Lines                                       8125     8125               
  Branches                                    1234     1234               
==========================================================================
+ Hits                                        3873     4713      +840     
+ Misses                                      4032     3123      -909     
- Partials                                     220      289       +69     

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