Improved warning message for number of skipped entries when loading database.
Improved warning message for number of skipped entries when loading database.

The new error message also tells you which database the skipped entries
are found in, so you can address them if desired.

nyee/RMG-Py,comocheng/RMG-Py,faribas/RMG-Py,pierrelb/RMG-Py,faribas/RMG-Py,pierrelb/RMG-Py,chatelak/RMG-Py,nickvandewiele/RMG-Py,chatelak/RMG-Py,enochd/RMG-Py,enochd/RMG-Py,nyee/RMG-Py,KEHANG/RMG-Py,nickvandewiele/RMG-Py,KEHANG/RMG-Py,comocheng/RMG-Py