[Stellarium-pubdevel] Add/remove landscapes feature

[Bogdan M. <dag...@gm...>]

Hello to all.

I've merged my experimental AddRemoveLandscapes plug-in to the core
code. The branch is here:
https://code.launchpad.net/~daggerstab/stellarium/add-remove-landscapes

The code went to the LandscapeMgr class and a sub-window of the Sky
and viewing options window (ViewDialog), with minimal changes to
ViewDialog itself. Now there is a "Add/remove landscapes..." button in
the Landscapes tab that opens the sub-window.

It's not ready for merging yet (there is some more work on my other
computer that I need to merge), but comments and suggestions are
welcome. Bug reports too. :)

A minor issue that I am unsure about is line 315 (now 322) in
ViewDialog.cpp (see this diff link:
http://bazaar.launchpad.net/~daggerstab/stellarium/add-remove-landscapes/revision/4746#src/gui/ViewDialog.cpp
). It seems to work OK with my changes.

At the moment, LandscapeMgr does not protect the default landscapes
from being deleted. They are excluded from the list in the GUI, but I
don't think that this is enough protection. Also, the list of default
landscapes needs to be updated manually. I'll try to have it generated
by CMake.

Regards,
Bogdan Marinov