[MODIF] Added methods to get cached entities avoiding accessing database
directly.
[MODIF] Added methods to get entities with synchronization if necessary.
[REFACTOR] Now fetch entries and records with synchronization if
necessary.
[MODIF] Set modification bits.
[COMMENT] Added task to implement add / update methods for Policy
entities.
[REFACTOR] Put Manager class into other package close to WriterThread
class for better access arch.
[REFACTOR] Placed entry update flag enum into utilities.
[REFACTOR] Moved logic into core package. Changed access from 'public'
to 'package' for ctors with preset ID for entities.
[COMMENT] Mark dangerous public method for private usage only, avoiding
using java reflection.