Ubuntu 22 support

See merge request !1

CentOS 7 uses g++ 4.8.5, which doesn't do c++14.
Had to revert use of make_unique to support CentOS runners.
Considered cutting CentOS 7 support, but it's the only RHEL/Cent
OS we support running on.  Maybe can deprecate CentOS 7
support when we get CentOS 8 or RHEL up.

Ubuntu18, Centos7.6 have pqxx that won't compile in c++17 mode.
This sounds like a bad dependency/include issue, though, as p1transform
shouldn't need to know that pqxx is involved in IRDB management.

A function that was checking supposed to be checking the entry point of a function was
checking the entire function.

Also included is a memory leak fix that now uses unique_ptr,
and some removal of commented-out code.