Fixed bug in preview for Windows and accepted both tab/space as delimiters.

From: Ark <aaku@users.sf.net>

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@829 ef8490bc-f317-4725-81ed-e95a9aca1bcf
Prompt for confirmation when edit dialog is closed without saving.

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@830 ef8490bc-f317-4725-81ed-e95a9aca1bcf
Parse working directory for variables.

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@831 ef8490bc-f317-4725-81ed-e95a9aca1bcf
Forgot to remove a debug raise statement.

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@832 ef8490bc-f317-4725-81ed-e95a9aca1bcf
Remove duplicated hotkey handling for zoom.

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@833 ef8490bc-f317-4725-81ed-e95a9aca1bcf