* warn to stderr when un-setting inapplicable CPP flag on output links
* Warn and unset CP flag for output links
* use errlogprintf instead of fprintf for dbParseLink CP/CPP warning
* Pass source record name to dbParseLink for debug information when modifier is discarded
* make CP/CPP discard warning less verbose
* Include field name of affected record when warning of CP/CPP discard
In some cases the license-identification header was missing,
so I added that as well. Replaced the remaining headers that
specifically identified "Versions 3.13.7 and higher".
Makefiles and the build system were deliberately excluded.