Make it possible to silence full screen message (issue xolox#26)

Make it possible to disable use of the DDL (useful during testing)

Increase verbosity of xolox#shell#can_use_dll()

Merge pull request xolox#25: Support MacVim fullscreen

Remove duplicate help tag (issue xolox#20)

See issue xolox#20 on GitHub:
  xolox#20

Make sure vim-misc is installed, politely complain if it isn't

Improvements on pull request xolox#16

See pull request xolox#16 on GitHub:
  xolox#16

Improve quoting in execute_with_dll() (xolox/vim-easytags#51)

I'm not yet 100% convinced this will work in all cases & environments,
because the rule* seems so crazy and arbitrary (coming from a UNIX
background). However I did test this quite a bit and it seems to work
reliably... Depending on how you read the documentation it could also
make sense :-)

For further discussion, see:
  xolox/vim-easytags#51

* "The rule": If your command line is properly quoted, just wrap it in
  another set of double quotes without escaping any of the double quotes
  inside and it will Just Work... Who comes up with this stuff?!

Merge pull request xolox#14

Pull request xolox#14 on GitHub:
  xolox#14

Bug fix for 64 bit Windows backend of xolox#shell#execute_with_dll()

This bug fix is not actually confirmed to resolve the problem that was
reported in issue xolox#13 (yet), however going by the documentation this is
an improvement in any case, so I will go ahead and release it and hope
it also fixes the reported problem :-)

Related to issue xolox#13 on GitHub:
  xolox#13