Development release 2.0.1

[dgud]

Fixed most of the reported issues in 2.0.1

- Added OpenGL version check, for future version requirements [bjorng]

- Unselected vertex size was not changed after changing it in the
Preferences. [micheus]

- Fixed color selection for lights by using wings color selector
when alpha value is required. [dgud]

- Added support for loading multiple images in Import Image command. [micheus]

- Fixed labels and textbox aligment for Absolute Command->Move/Scale [micheus]

- 1) Yafaray plugin update:
- Reworked in the layout of the Yafaray "Render Options" dialog;
- made some changes asked by oort;
- fixed some bugs found by oort
- updated the help information for material and lights;

2) POV-Ray plugin update:
- fixed some controls alignments

3) Kerkythea plugin update:
- fixed some controls alignments

4) wpc_absolute_move.erl
- fixed control alignments

5) wings_light.erl
- fixed alignment [micheus]

- Fixed double click drag selection [dgud]

- Fixed other minor problems reported in the forum including
- Log/Console window related issues
- Linux installer problems
- Set keyboard focus in dialogs
- Multisampling preference
[dgud]