Changed file names with 40 to no version indicated, updated refs to AG version

The refs are to 5.0 or eliminated (i.e. just AllegroGraph, no
version).  Filenames with 40 are now filenames without version
indicator. Made links to docs /current/ rather than v4.0 or v5.0.

Change-Id: I9a58e736a1b911f4f796b8bf9e9918e6d434b81d
Reviewed-on: https://gerrit.franz.com:9080/4328
Reviewed-by: Ahmon Dancy <dancy@franz.com>
Reviewed-by: John O'Rourke <jor@franz.com>
Tested-by: Kevin Layer <layer@franz.com>