Updates to BBA development flow

Switch BBA project download to new official source. Allow to build cbmroot against local BBA repository by giving path as cmake option.

external/InstallBBA.cmake

+if(BBA_LOCAL_DIR)
+
+  Add_Subdirectory(${BBA_LOCAL_DIR} bba_local)
+  Set(BBA_INCLUDE_DIRECTORY ${BBA_LOCAL_DIR}/include PARENT_SCOPE)
+
+else()
+
   download_project_if_needed(PROJECT           bba
-                             GIT_REPOSITORY    "https://git.cbm.gsi.de/se.gorbunov/bba.git"
+                             GIT_REPOSITORY    "https://git.cbm.gsi.de/alignment/bba.git"
                              GIT_TAG           "e98ab50d4d1885a29abcf4af4e8bb8d722b02283"
                              SOURCE_DIR        ${CMAKE_CURRENT_SOURCE_DIR}/bba
                              CONFIGURE_COMMAND ""
@@ -8,3 +15,5 @@
   )
   Add_Subdirectory(bba)
   Set(BBA_INCLUDE_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/bba/include PARENT_SCOPE)
+
+endif()