FORUM-730 | [Forum] Fail to save last post id read

Conflicts:

	forum/service/src/main/java/org/exoplatform/forum/service/impl/JCRDataStorage.java
FORUM-719 | [TC-4.0.4] [Forum write Posts] Slowness in forum.service.impl.ForumServiceImpl.savePost invocation

Conflicts:

	forum/service/src/main/java/org/exoplatform/forum/service/impl/ForumServiceImpl.java
FORUM-795 | Wrong reply numbers of split topic in Topic Statistics

Conflicts:

	forum/service/src/main/java/org/exoplatform/forum/service/impl/JCRDataStorage.java
	forum/service/src/test/java/org/exoplatform/forum/service/ForumServiceTestCase.java
FORUM-822 | [TC-4.0.5][Forum Write]Patch validation of SOC-4034 and FORUM-719

Conflicts:

	forum/service/src/main/java/org/exoplatform/forum/service/cache/CachedDataStorage.java
	forum/service/src/main/java/org/exoplatform/forum/service/impl/JCRDataStorage.java
	forum/service/src/main/java/org/exoplatform/forum/service/jcr/listener/StatisticEventListener.java
	forum/service/src/test/java/org/exoplatform/forum/service/ForumServiceTestCase.java