Missing icons

[fabfurnari]

The following icons are missing:

• Dendrochronology menu
• Network applications menu
• Office menu
• Publishing applications menu
• Science Tools menu
• GPSBabel
• Ipe

Icons must be provided with the respective package (if possible) and in the menu-icon folder for other cases.

[fabfurnari]

Added icons for dendrochronology, network, office, publishing, science.