Improve debug output

[GlazerMann]

ADDED: If long is true, then print whole stack trace.

[codecov]

Codecov Report

Merging #500 into master will decrease coverage by 3.16%.
The diff coverage is 50%.

@@             Coverage Diff              @@
##             master     #500      +/-   ##
============================================
- Coverage     75.75%   72.59%   -3.17%     
  Complexity     1431     1431              
============================================
  Files             9        9              
  Lines          2458     2459       +1     
============================================
- Hits           1862     1785      -77     
- Misses          596      674      +78

Impacted Files	Coverage Δ	Complexity Δ
expandFns.php	95.86% <50%> (+0.03%)	0 <0> (ø)	⬇️
Template.php	79.56% <0%> (-4.38%)	1279% <0%> (ø)

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