Uniformize memory limits and remove old code (revised)
1) Allow setting a memory_limit up to 768M (Suhosin)2) Remove old workarounds. Memory limits on config.inc will be new defaults
Code style and comments
No functional change - just making style consistent
Improved solution to #6716
Fixed #6716
Fixed #6700
Fixed #6710
(cherry picked from commit 13b92290e0fa367a76016a15ccf5e76ff77b0706)
Fixed #6709
Fixed #6703
Fixed #6706
Fixed #6705
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