editing issue history...

Conflicts:
	java/ntut/csie/ezScrum/issue/core/IIssue.java
	java/ntut/csie/ezScrum/issue/internal/Issue.java

Conflicts:
	WebContent/Workspace/_metadata/initial_bk.sql
	java/ntut/csie/ezScrum/web/databasEnum/IssueTypeEnum.java
editing issue history

Conflicts:
	java/ntut/csie/ezScrum/issue/sql/service/internal/MantisHistoryService.java
	java/ntut/csie/ezScrum/web/databasEnum/IssueTypeEnum.java
edit issue history & fix some error