Changing version to 3.0.6

Changing version to 3.0.6

This is version 3.0.6 of Koha.
Change log :

bug fixes
bug #3348
bug #3536
bug #3894
bug #4002
bug #4004
bug #4020
bug #4021
bug #4038
bug #4043
bug #4044
bug #4049
bug #4050
bug #4052
bug #4055
bug #4075
bug #4084
bug #4326
bug #4276

Adds IndependentBranchPatrons system preferences for libraries which would not like to see patrons from other libraries
Adds  XSLT systempreferences so that path can be provided
Also adds CSV exports
Adds a page for subscription history management
Changes the way reserves are allowed. You HAVE TO enter the itemtypes and holds Policy in order to enable your patron to reserve

It adds 10 changes in database, which adds some new tables required for some partial features ports from 3.2 due to the previous release and updates languages tag for portuguese and updates Calendar SystemPreference.