renormalize short license names to dep5 final names

[Kyle Nitzsche]

getlicenses has a file that lists the short licenses names:
/usr/share/getlicenses/short_license_names

GL code normalizes found licenses to this list where possible.

This list of short license names was created when Dep5 was still proposed and needs to be audited against the current list.

Note: SPDX considers Dep5 short names to be valid, so this step is critical to harmonizing.

[Kate Stewart (kate.stewart)]

Actually DEP5 considers SPDX ones as valid not the other way around.
From: http://dep.debian.net/deps/dep5/#license-short-name:
  "For licenses which have multiple versions in use, the version number is added, using a dash as a separator. If omitted, the lowest version number is implied. When the license grant permits using the terms of any later version of that license, the short name is finished with a plus sign. For SPDX compatibility, trailing dot-zeroes are considered to be equal to plainer version (e.g., "2.0.0" is considered equal to "2.0" and "2"). "

OSI has addopted the SPDX short forms: http://opensource.org/licenses/alphabetical

Full license list can be found at: http://spdx.org/licenses/