actually implement row size estimator
changes as per code review
makes Sam's changes
fixes cJSON double counting
reverts temporary change to libunwind config
fixes switch automatic variable declaration
Merge branch 'next' into issue_597_rget_data_cap
replace r_datum with datum
Merge pull request #651 from taybin/fix_old_ql2_comments

replace r_datum with datum
Merge branch 'next' into sam_457_sans_libcxx