Version 2.1.2 released

Changes from previous version:

• Added accelerator characters to almost all the labels to navigate trough their associated input controls more quickly.
• Object properties dialog, fields editor: added the buttons "Move up" and "Move down" to replace the unhandy popup menu.
• Rule properties dialog: added a box with an explanation of valid field name mask and field value mask composition.
• Rule properties dialog: added the name of the rule to the window title to keep it always visible.
• Rule properties dialog (italian translation): translated the color names for the color boxes in the highlight tab.
• Minor visual improvements.