- move package/archive handling into new data structure
  * remove getReplacePackageDelList/getReplacePackageAddList
  * implemented for kiwi's prepare, create and upgrade modes
  * reduced the use of the following legacy functions:
    + getArchiveList_legacy
    + getDeleteList_legacy
    + getBaseList_legacy
    + getTypeSpecificPackageList_legacy
    + getInstallList_legacy
- change processing order of upgrade request:
  * handle the requested deletion of packages last
- new tests to cover the newly implemented methods related to VHD tagging
- improved information provided by .releasetags helper tool
- move KIWIXMLInfo module to use new data structure.
  The following legacy functions are not in use anymore:
  * getInstallSize_legacy
  * getURLHash_legacy
  * setPackageManager_legacy
  * __createURLList_legacy
- removed following legacy functions:
  * getTypeSpecificPackageList_legacy
  * getArchiveList_legacy
  * getBaseList_legacy
  * getDeleteList_legacy
  * getInstallList_legacy
  * getInstallSize_legacy
  * getPackageManager_legacy
  * setPackageManager_legacy
  * getURLHash_legacy
  * getRepoNodeList_legacy
  * addRemovePackages_legacy
  * getStripNodeList_legacy
  * getBootIncludes_legacy
  * addPatterns_legacy
  * addPackages_legacy
  * addImagePatterns_legacy
  * addImagePackages_legacy
  * addArchives_legacy