SAK-13584 - Mailarchive conversion (2.6)

SAK-13584 - Getting issue details... STATUS , SAK-16554 - Getting issue details... STATUS : Sakai 2.6 improvements to the Message API require that implementers upgrading from a pre-2.6 version of Sakai run both the 2.6.0 conversion scripts and a second mailarchive-runconversion.sh script that can be found in the mailarchive module in order to update your existing mail archive data to take advantage of the 2.6 Email Archive performance improvements.

-- SAK-13584 Further Improve the Performance of the Email Archive and Message API. Note you have to run a bash conversion script on your old mail archive data for it to
-- appear in the new mail archive. The script is in the source as mailarchive-runconversion.sh. Please see the SAK for more information on this script or SAK-16554 for
-- updates to this script.
	  	 
	  	 CREATE INDEX IE_MAILARC_SUBJECT ON MAILARCHIVE_MESSAGE
 	  	 (
 	  	        SUBJECT                   ASC
 	  	 );
	  	 ALTER TABLE MAILARCHIVE_MESSAGE ADD COLUMN (
 	  	        SUBJECT           VARCHAR (255) NULL,
	  	        BODY              LONGTEXT NULL
 	  	 );