[nose2] 0.5.0 version bump

Closes #850.

Package-Manager: portage-2.2.8-r2
Manifest-Sign-Key: ABC68E07
Merge branch 'f/bumps'

* f/bumps:
  [nose2] 0.5.0 version bump
Add nose2_cov deprecation news item
[texttable] Removed, available upstream

Closes #849.
[pycallgraph] Removed, available upstream

Closes #848.
[parse] Removed, available upstream

Closes #847.
Manual update of removal texts
Merge branch 'f/removals'

* f/removals:
  Manual update of removal texts
  [parse] Removed, available upstream
  [pycallgraph] Removed, available upstream
  [texttable] Removed, available upstream