repo editing patches

This is patch 5/6 from my first repo editing patches set split into smaller bits.

Follow-Ups:
- [PATCH 03/14] Log more, repo editing UI.
  - From: Radek Vykydal
- [PATCH 04/14] Do not use object we are creating.
  - From: Radek Vykydal
- [PATCH 02/14] Make _enableRepo a bit cleaner.
  - From: Radek Vykydal
- [PATCH 01/14] Yum doesn't like repo baseurl containing space.
  - From: Radek Vykydal
- [PATCH 07/14] Disable repo before deleting it, otherwise yum will want to use it later.
  - From: Radek Vykydal
- [PATCH 05/14] Use correct format of cdrom: repo= parameter.
  - From: Radek Vykydal
- [PATCH 06/14] Actually set _baseRepoURL.
  - From: Radek Vykydal
- [PATCH 08/14] Do not delete repo twice or when it had not been added actually.
  - From: Radek Vykydal
- [PATCH 12/14] Fix methodstr editing dialog.
  - From: Radek Vykydal
- [PATCH 09/14] Use temporary repo id for edited object to prevent Duplicate Repo error.
  - From: Radek Vykydal
- [PATCH 10/14] Don't traceback with malformated repo= nfs: parameter.
  - From: Radek Vykydal
- [PATCH 11/14] Store methodstr url of repo.
  - From: Radek Vykydal
- [PATCH 14/14] Handle Installation Repo (base repo) as any other in repo edit UI.
  - From: Radek Vykydal
- [PATCH 13/14] Show user of which repository he edits the url (methodstr editing).
  - From: Radek Vykydal