- alternative to WM_PROJECT_INST_DIR/site for systems with locked down
installation paths (eg, when packaged as RPM or deb)
When "$WM_PROJECT_SITE" is defined, it is used in favour of
"$WM_PROJECT_INST_DIR/site"
- drop reference to license directory
- check -help before checking directories
- search for foamLog.db is more consistent with foamEtcFile
$HOME/.OpenFOAM/$WM_PROJECT_VERSION
$HOME/.OpenFOAM
$WM_PROJECT_INST_DIR/site/$WM_PROJECT_VERSION
$WM_PROJECT_INST_DIR/site
$WM_PROJECT_DIR/etc
$PROGDIR/tools