various (v0.75)
added write methods to dc and pc
changed names of readAccount(s) and writeAccount(s) to readSeqAccount(s) or writeSeqAccount(s) where appropriate
patched DBUtil methods with correct SQL statements
renamed EmptyParameterException to ValidateStringsException
added ValidateIDException
added ConnectionNotOpenException
edited AccountNotFoundException
removed unused imports
refactored all set methods which handle Strings