refactored PhotoDB somewhat
making PhotoDB accommodate multiple table schemas; still not fully functional
added constructor for custom schemas
documenting mostly, also testing insertRow
split off enum into its own file & added corresponding java.sql.Type ints; can now insert null into columns
- fixed errors in setPrepStatementParam (and renamed it)
- fixed settings not being saved in SettingsDialog
- DataType has LONG mapped (back) to java.sql.Types.BIGINT
realized setPrepStatementParam() could be shortened; getSpecificPhoto() finally works!
updated readme with things TODO
Merge https://github.com/micwa6/PhotoDB

Conflicts:
	LICENSE