Clear func calls during flush

[Stanback]

I ran into a bit of a memory "leak" when running, what do you recommend? It looks like the function call stack was getting filled up:

PHP Fatal error:  Allowed memory size of 4294967296 bytes exhausted (tried to allocate 536870920 bytes) in /htdocs/lib/vendor/ezsql/ezsql/lib/ezsqlModel.php on line 272

A solution is to clear it out during flush()..

[codecov-io]

Codecov Report

Merging #183 into master will decrease coverage by 1.44%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #183      +/-   ##
============================================
- Coverage     86.36%   84.92%   -1.45%     
  Complexity      793      793              
============================================
  Files            14       14              
  Lines          1958     2003      +45     
============================================
+ Hits           1691     1701      +10     
- Misses          267      302      +35     

Impacted Files	Coverage Δ	Complexity Δ
lib/ezsqlModel.php	90.68% <100.00%> (+0.03%)	112.00 <0.00> (ø)
lib/Database/ez_sqlsrv.php	74.35% <0.00%> (-8.50%)	65.00% <0.00%> (ø%)
lib/ezQuery.php	75.15% <0.00%> (-2.25%)	204.00% <0.00%> (ø%)
lib/Database/ez_sqlite3.php	91.53% <0.00%> (+0.76%)	55.00% <0.00%> (ø%)

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[TheTechsTech]

Seems reasonable, there needs to be a better way to keep track of all log calls.
It was added from a feature request some time ago, and memory will eventually get filled, the way it currently works, with no release.