Fix FitsRequest onabort
Refactor UWS services
   * Unify CutOut/ZScale by creating UWSBase module
   * Add HEALPixCut module(TODO: interface to move)
Add eye position tracker
Add forgotten image for tabs
Fix hard-coded parameters for SAMP VO export
Add HEALPixCut service, better service management
   * Add "availableServices" parameter to configuration
   * Fix some bugs for Moc/XMatch services
   * Refactor send viewport from reverseNameResolver