NetKAN: No longer index pre-releases.

Exercises existing test cases (new commits without this patch will start
failing.)

Closes #273.
Merge pull request #274 from pjf/273_in_soviet_russia_prereleases_index_you

NetKAN: No longer index pre-releases.
Fixes tabs to spaces.

I feel silly committing this, but my git settings cry and scream at me
if they spot tabs in files, because they assume *my* copy of monodevelop
added them.

No code changes present.
Merge pull request #275 from pjf/spacing

Fixes tabs to spaces.
Extra test to ensure DLLs participate in conflicts.

For #235.

No changes to user code.
Merge pull request #276 from pjf/235_tests

Extra test to ensure DLLs participate in conflicts.
Fix unused variable warnings.

In b0f96cb0a60caaccc1c6ea5f981ad8dca09d025c the variable `DoUpdate` was
renamed to `Update`¹, re-introducing warnings that were fixed in #173.

This change removes said warnings.

Tested on the GUI; I can tick the update box just fine, and indeed just
updated my version of DeadlyReentry. :)

Attn: @AlexanderDzhoganov in case I've screwed anything up, but I'm
pretty sure I'm good. :)

¹ Git bisect is *seriously* the best thing ever.
Merge pull request #277 from pjf/fix_warnings

Fix unused variable warnings.