Removed hardcoded project name in CMakeLists.txt
Added tlap-6-problems: Array parity, array positive sum.
Fixed sum_positive_r recursive invocation.

Renamed array_parity => is_odd_parity.
Added recursive is_odd_parity_r.
tlap-lib print_arr now takes optional parameter for new_line.
Simplified is_odd_parity_r logic. New version in is_odd_parity_r2
Moved tlap-lib into its own set of namespaces.
[style] Ran a style/indentation pass.
Added number_count.

Clearer precondition for parity calculation functions.
Added binary tree heap determination.