[Gchemutils-main] Release of the Gnome Chemistry Utils 0.7.4

[Jean Bréfort]

Hi,

This is an unstable version and it might be unreliable. It might even
not compile (if this happens, please tell).
It can be installed in parallel with a stable release.

News are: 

- 3d viewer:
  * add recent files support.
  * image export at any resolution.

- Gnome Crystal:
  * add recent files support.
  * image export at any resolution.
  * share more code with the 3d molecules viewer.

- periodic table:
  * add new color schemes to the table (thanks to Jordan Mantha
  for his help with this feature).

- Library:
  * extend color schemes mechanism in the GtkPeriodic widget.
  * now parse all BODR data in element class.
        
- Other:
  * fixed various build issues (Daniel Leidert).

Sources are available as usual at:
http://download.savannah.nongnu.org/releases/gchemutils/gnome-chemistry-utils-0.7.4.tar.bz2
http://download.savannah.nongnu.org/releases/gchemutils/gnome-chemistry-utils-0.7.4.tar.gz

Best regards,
Jean Bréfort