This change adds a [cond] grammar symbol corresponding to binary
relations in IF, IFELSE and WHILE conditions. It also adds support for
unary functions with parenthesis syntax. Other functions will need
specific rules depending on their operator precedence level.
Also adds the Window.save() function that implements the --save option
to save the output of the program into a bitmap file. This will be used
to perform automated unit tests.
Pavel Demin
Lephe