Revert "Simple hack/fix to allow tab in insert mode when completing function and template arguments"

This reverts commit d9dccefca96f95a1d1543425dec33fbfadd7daf0.

This caused conflicts with supertab and ultisnips. I revert it for now.

I still like this functionality, but we obviously need to design it
better.
Merge pull request #409 from tobig/revert-tab-in-insert-mode

Revert "Simple hack/fix to allow tab in insert mode when completing func...
set mark when jumping to location in current file

The normal mode command m' was there before but got broken by commit 6f491682: m without the single quote is not a normal mode command. When changing files, the jump list is already updated.
Merge pull request #410 from brunodefraine/patch-1

set mark when jumping to location in current file